Figure 31. Allopora oculina, Ehrenberg. Coral. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 32. Figure 33. Ophiomusium lymani, Wyville Thomson. Dorsal surface. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 33. Ophiomusium lymani, Wyville Thomson. Oral surface. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 34. Dorynchus thomsoni, Norman. Everywhere in deep water. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 35. Amathia carpenteri, Norman. deep sea crab. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Plate V - track of H.M.S. PORCUPINE - 1870 In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 36. Chondrocladia virgata, Wyville Thomson. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 37. the "cup lead'. A bottom-sampling device. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 38. Brooke's deep-sea sounding apparatus. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 39. Brooke's deep-sea sounding apparatus. Weight releases after penetrating bottom. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 40. The 'bull-dog' sounding machine. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 41. The 'Fitzgerald' sounding machine. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 43. 'Massey's' sounding machine. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 44. Otho Frederick Muller's dredge. A.D. 1750. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 45. Ball's Dredge. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 46. The stern derrick of the 'Porcupine' showing the 'accumulator' , the dredge, and the mode of stowing the rope. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 47. The end of the dredge frame. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 48. Dredge-frame showing the mode of attachment of the bag. a. Spunyarn stop. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 49. The end of the dredge-frame showing the mode of attachment of the bag In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 50. Diagram of the relative position of the vessel, the weights, and the dredge, in dredging in deep water. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 51. Dredge with 'hempen tangles.' In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 52. Set of dredging sieves. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 53. The Miller-Casella modification of Six's self-registering thermometer . The large bulb is double with a layer of liquid and a bell of vapour between the shells to relieve pressure. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 55. Serial sounding, Station 64. Figure 56. Serial sounding, Station 87 In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 57. Curves constructed from serial soundings in the 'warm' and 'cold- areas' in the channel between Scotland and Faeroe. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 58. Curves constructed from serial and bottom soundings in the channel between Scotland and Rockall. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 59. Diagram representing the relation between depth and temperature of Rockall. Figure 60. Diagram representing the relation between depth and temperature in the Atlantic basin. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Plate VI. - Diagram of the 'Porcupine" soundings in the Atlantic and in the Faeroe Channel, showing the relation between temperature and depth, - the serial soundings reduced to curves. The numbers refer to the stations on the Charts, Plates II, III, and IV. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 61. Curves constructed from serial and bottom temperature soundings in the Atlantic Basin. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 62. Diagram representing the relation between depth and temperature, from the temperature observations taken between Cape Finisterre and Cape St. Vincent , August 1870. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Plate VII. - Physical Chart of the North Atlantic; showing the depth, and the general distribution of temperature for the month of July. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 63. - A drawing of the chemical emulsion that was mistakenly thought to be a living organism dubbed "bathybius." In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 64. - Coccosphere. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 65. - Rossella velata, Wyville Thomson. A sponge. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 66. - Hyalonema lusitanicum, Barboza du Bocage. A stalked sponge. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 67. - Askonema setubalense, Kent. A vase sponge. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 68. - Flabellum distinctum. A deep sea hexacoral. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 69. - Thecopsammia socialis, Pourtales. A cup coral. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 70. - Pentacrinus asteria, Linnaeus. A crinoid. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 71. - Pentacrinus wyville-thomsoni. A crinoid. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 72. - Rhizocrinus loffotensis, M. Sars. A crinoid. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 73. - Bathycrinus gracilis, Wyville Thomson. A crinoid. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 74. - Archaster bifrons, Wyville Thomson. Oral aspect. A starfish. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 75. - Solaster furcifer, Von Duben and Koren. Oral aspect. A starfish. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 76. - Buccinopsis striata, Jeffreys. Faeroe Channel. Figure 77. Latirus albus, Jeffreys. Faeroe Channel. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 78. - Pleuronectia lucida, Jeffreys. a, from the Eastern Atlantic; b, from the Gulf of Mexico. A small type of scallop. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 79. - Pecten hoskynsi, Forbes. A scallop. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Plate VIII. - Map showing the general distribution of the Tertiary, the Cretaceous, and the Jurassic systems in the north-west of Europe with reference to contour. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 80. - Ventriculites simplex, Toulmin Smith. A sponge. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.

Figure 81. - Ventriculites simplex, Toulmin Smith. Outer surface of this type of sponge. In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.