. Bulletin of the Essex Institute. Essex Institute; Natural history; genealogy. 68 COELENTERATA AND Apical area with irregular plates. Pluteus without anal rods. S. Drobachiensis. Clypeastroids. JEchinarachnius. Body nearly circular, very flat with sharp, entire margin. Vent close to edge. Petaloid re-. ECHINARACHNIUS. gion marked. Spines small, short, brown or reddish color. Pluteus without anal rods. E. yparma. Sjpatangoids. Schizaster. Body heart-shaped, irregular, oval with avenues on the upper surface. Mouth asymmetrical. Test thin, fragile. Ambulacral zones depressed and petaloid. Pluteu
. Bulletin of the Essex Institute. Essex Institute; Natural history; genealogy. 68 COELENTERATA AND Apical area with irregular plates. Pluteus without anal rods. S. Drobachiensis. Clypeastroids. JEchinarachnius. Body nearly circular, very flat with sharp, entire margin. Vent close to edge. Petaloid re-. ECHINARACHNIUS. gion marked. Spines small, short, brown or reddish color. Pluteus without anal rods. E. yparma. Sjpatangoids. Schizaster. Body heart-shaped, irregular, oval with avenues on the upper surface. Mouth asymmetrical. Test thin, fragile. Ambulacral zones depressed and petaloid. Pluteus with single median calcareous rod on the anal lobe. 8. 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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