. Bulletin of the Essex Institute. Essex Institute; Natural history; genealogy. ECHINODERMATA OF NEW ENGLAND. 59 of the body. Our common sea-urchin sometimes exca- vates cavities in the solid rock. In the "sea-cucumbers" the structure of the ambula-. SEA-URCHINS IN EXCAVATIONS. cral plates is obscure. In some genera a foot is formed by the modification of three of these series ; in Cucumaria we find five double rows, and in Thy one the suckers are ir-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - colorati
. Bulletin of the Essex Institute. Essex Institute; Natural history; genealogy. ECHINODERMATA OF NEW ENGLAND. 59 of the body. Our common sea-urchin sometimes exca- vates cavities in the solid rock. In the "sea-cucumbers" the structure of the ambula-. SEA-URCHINS IN EXCAVATIONS. cral plates is obscure. In some genera a foot is formed by the modification of three of these series ; in Cucumaria we find five double rows, and in Thy one the suckers are ir-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Essex Institute. 1n. Salem, Mass. , Essex Institute
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