. A manual of zoology for the use of students : with a general introduction on the principles of zoology . Zoology. 1S4 MANUAL OF ZOOLOGY. and open by orifices on the ventral surface of the body or in the interbrachial areas. It is very questionable whether the ambulacral system in the adult Ophiuroidea communicates with the exterior; its place as a locomotive apparatus being taken by the arms. The radial vessels of the ambulacral system are not provided with secondary vesicles or " ampullae," as they are in the Echinoidea and Asteroidea, and the lateral " feet" which they
. A manual of zoology for the use of students : with a general introduction on the principles of zoology . Zoology. 1S4 MANUAL OF ZOOLOGY. and open by orifices on the ventral surface of the body or in the interbrachial areas. It is very questionable whether the ambulacral system in the adult Ophiuroidea communicates with the exterior; its place as a locomotive apparatus being taken by the arms. The radial vessels of the ambulacral system are not provided with secondary vesicles or " ampullae," as they are in the Echinoidea and Asteroidea, and the lateral " feet" which they give off have no terminal suckers. The madreporiform tubercle is either. Fig. 43,—Ophiuroidea. a 0J>7tinyn texi-urata, the common Sand-star; b Ophiocoma tteglecta^ the grey Brittle-star (after Forbes). placed on the inferior surface of the body or is partially con- cealed by one of the plates surrounding the mouth. The larva of the Ophiuroidea is pluteiform, and is furnished with a continuous endoskeleton; and in some, as in Ophio- lepis squamata, the echinoderm-body appears within the larva, when the latter has attained but a very imperfect degree of development. In Euryak the body is in the form of a sub-globose disc with five obtuse angles, and the arms are prehensile. In As-. 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 : D. Appleton
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