. Echinoderms of Connecticut. Echinodermata -- Connecticut. NO. I. ECHINODERMS OF CONNECTICUT. hard, spiny body coverings possessed by the starfish, brittle stars, and sea-urchins, the holothurians have soft, sac-like or worm-like bodies (Plates XXIX, XXXI, XXXII), in the skin of which only very small calcareous plates are found. The mouth, at one end of the elongated body, is surrounded by a circle of branched oral tentacles comparable with the oral tube-feet or tentacles of the other Echinoderms. The intestine ends in a sac-like cloaca at the end of the body opposite the mouth. RD. LV--(- FI
. Echinoderms of Connecticut. Echinodermata -- Connecticut. NO. I. ECHINODERMS OF CONNECTICUT. hard, spiny body coverings possessed by the starfish, brittle stars, and sea-urchins, the holothurians have soft, sac-like or worm-like bodies (Plates XXIX, XXXI, XXXII), in the skin of which only very small calcareous plates are found. The mouth, at one end of the elongated body, is surrounded by a circle of branched oral tentacles comparable with the oral tube-feet or tentacles of the other Echinoderms. The intestine ends in a sac-like cloaca at the end of the body opposite the mouth. RD. LV--(- FIG. 20. Diagram of transverse section of the body of a holothurian. D, dorsal interradius; I, I', I", first, second, and third sections of in- testine attached to adjacent inter- radii; LD, LV, RD, RV, and V, left dorsal, left ventral, right dorsal, right ventral, and ventral radii, res- pectively. The body is in most species adapted for creeping upon the sea bottom; and, as the animal habitually creeps with the same side uppermost, there has come about a fairly well-marked dif- ferentiation into a ventral and a dorsal surface. Three of the five ambulacral areas are situated upon the ventral surface, and are usually provided with more highly developed tube-feet, or pedicels, with sucking disks. The pedi- cels of the two dorsal ambulacral areas are commonly modified as delicate finger-like processes used for respiration and sensation. In many forms, as Thy one (Plate XXXI), the pedicels are scat- tered over the whole surface of the body, while in such burrowing forms as Synapta there are no pedicels whatever (Plate XXIX, figs- i, 3)- With the habit of creeping upon the side there has also come a bilateral symmetry of the body, so that it is customary to speak. 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 work
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