. A manual of zoology. vii PHYLUM ECHINODERMATA 165 of fats. From the short intestine are given off inter-radially two hollow appendages, the intestinal cceca (Fig. 89, Int. cac), each with several short branches of irregular shape. Running downwards from the madreporite to near the border of the mouth, is an S-shaped cylinder, the madreporlc or stone-canal (Fig. 88, St. c). The walls of this canal are supported by a series of calcareous ossicles. The interior of. Fig. 89.—Asterias rubens. Digestive system. an, anus; card. st. cardiac division of the stomach; int. ctzc, intestinal casca; madr,
. A manual of zoology. vii PHYLUM ECHINODERMATA 165 of fats. From the short intestine are given off inter-radially two hollow appendages, the intestinal cceca (Fig. 89, Int. cac), each with several short branches of irregular shape. Running downwards from the madreporite to near the border of the mouth, is an S-shaped cylinder, the madreporlc or stone-canal (Fig. 88, St. c). The walls of this canal are supported by a series of calcareous ossicles. The interior of. Fig. 89.—Asterias rubens. Digestive system. an, anus; card. st. cardiac division of the stomach; int. ctzc, intestinal casca; madr, madreporite; ply. one, pyloric caeca; pyl. st, pyloric division of the stomach. (From Leuckart.) the madreporic canal communicates above with the exterior through the grooves of the madreporite. Below, the canal opens into a wide, five-sided, ring-like canal, the ring-vessel of the ambulacral system. From this are given off the five radial ambulacral vessels, passing to the extremities of the arms. From the pentagonal canal are given off also a series of five pairs of appendages, the Polian vesicles (Fig. 90, ap),. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.
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