Figure 28. Calveria hystrix, Wyville Thomson. Inner surface of a portion of the
test showing the structure of the ambulacral and interambulacral areas.
In: Thomson, Wyville. 1873. The Depths of the Sea. MacMillan and Co., London.
Image ID: expl3201, Voyage To Inner Space - Exploring the Seas With NOAA Collect Credit: NOAA Central Library Historical Collections
