. Bulletin of the Essex Institute. Essex Institute; Natural history; genealogy. ECHINODERMATA OF NEW ENGLAND. 67 of petaloid openings. Anus on edge of disk. Aristotle's lantern. Development with platens. Ovaries five. III. Spatangoids. Body swollen, globular, elongated. Ambulacra! zones tof different lengths, and more or less modified mouth and vent asymmetrical. No Aristotle's lantern. Development with pluteus. Ovaries four. Echinoids. Arbacia. Body globose; vent and mouth opposite; two kinds of spines, the larger few in number ; color pur- ple. Anus closed by four triangular plates. Pluteus
. Bulletin of the Essex Institute. Essex Institute; Natural history; genealogy. ECHINODERMATA OF NEW ENGLAND. 67 of petaloid openings. Anus on edge of disk. Aristotle's lantern. Development with platens. Ovaries five. III. Spatangoids. Body swollen, globular, elongated. Ambulacra! zones tof different lengths, and more or less modified mouth and vent asymmetrical. No Aristotle's lantern. Development with pluteus. Ovaries four. Echinoids. Arbacia. Body globose; vent and mouth opposite; two kinds of spines, the larger few in number ; color pur- ple. Anus closed by four triangular plates. Pluteus with two lateral anal rods. A. jpunctulala, STRONGYLOCENTROTUS. Strongylocentrotus. Body globose ; anus and mouth op- posite. Spines ot one kind, short, small, greenish 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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