. Text-book of zoology for junior students. Zoology. ECHINODEEMATA. 105 teen in number, and shorter than the diameter of the disc. In the Cushion-stars (Goniaster) the body is in the form of a five-angled disc, more or less flattened on both sides, the rays being only marked out by the ambulacral grooves vipon the lower surface. Order III. Ophiuroidea. This order comprises the common Brittle-stars and Sand-stars {Ophioglypha, Ophiura, Ophiothrix, Opluocoma, &c.) The body in. Fig. fi5.—Opliiurniilcn. Ophii^dhjflw, lacertosa: A, Outline, of tlie iiutural size; B, Tlic liiso \'ieweil froiri a
. Text-book of zoology for junior students. Zoology. ECHINODEEMATA. 105 teen in number, and shorter than the diameter of the disc. In the Cushion-stars (Goniaster) the body is in the form of a five-angled disc, more or less flattened on both sides, the rays being only marked out by the ambulacral grooves vipon the lower surface. Order III. Ophiuroidea. This order comprises the common Brittle-stars and Sand-stars {Ophioglypha, Ophiura, Ophiothrix, Opluocoma, &c.) The body in. Fig. fi5.—Opliiurniilcn. Ophii^dhjflw, lacertosa: A, Outline, of tlie iiutural size; B, Tlic liiso \'ieweil froiri al>ove, twice tlie size ; C, Tlie dise liewed from below, showing the mouth and yenital lissmx-s, twieo the natural size. ((Jriginal.) the Ophiuroidea consists of a circular central disc covei'ed with small calcareous plates, and giving olf five long .slender arms (fig. ),. 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 Nicholson, Henry Alleyne, 1844-1899. New York, American Book Co
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1885
