. Bulletin of the Essex Institute. Essex Institute; Natural history -- Periodicals; Essex County (Mass. ) -- History Periodicals. ECHINODERMATA OF NEW ENGLAND. 65 Ophiuridoe. Disk circular and tegumentose above, with or without radial plates. No anus. Madreporic body small, or wanting. Arms simple, with aboral, lateral and ventral plates. Ambulacra! plates hidden under the ventral. Blood system and nerves covered by vential plates ; feet in single rowat edge of the ventral plates, without suckers or ampullae. Motion by jerks. Hermaphrodite or bisex- ual. Young has a free pluteus, or adult vivi
. Bulletin of the Essex Institute. Essex Institute; Natural history -- Periodicals; Essex County (Mass. ) -- History Periodicals. ECHINODERMATA OF NEW ENGLAND. 65 Ophiuridoe. Disk circular and tegumentose above, with or without radial plates. No anus. Madreporic body small, or wanting. Arms simple, with aboral, lateral and ventral plates. Ambulacra! plates hidden under the ventral. Blood system and nerves covered by vential plates ; feet in single rowat edge of the ventral plates, without suckers or ampullae. Motion by jerks. Hermaphrodite or bisex- ual. Young has a free pluteus, or adult viviparous. Genital slits large. Ophiqpholis. Disk with small spines. Teeth. No teeth papillae. Arm-spines flat, stout, arranged on the side plates. Color generally brownish- red. Primary plates in brachial and in- terbrachial regions. Young, pluteus. O. aculeata. Ophioylypha. Disk with crowded, nak- ed, distorted scales. Radial shields swol- len. Arm-spines few (three). Tentacle scales numerous. Color gray with light bands on the arms, also yellowish. Probably viviparous. O. Sarsii. Amphiura. Disk small, delicate, with naked overhanging scales. Arms slender. Arm-spines short. Arms four and one-half times the diameter of body. Color brown. Vi- vinarous. *x* SQWCitiicicoi* ESSEX INST. BULLETIN, VOL. XXIII 5. 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. Salem, Mass. , Essex Institute
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