Elements of biology, with special Elements of biology, with special reference to their rôle in the lives of animals elementsofbiolog00buch Year: 1933 MOUTH FOOT WATER-yASCULAR SrSTEM FIG. 47. SEA URCHIN FIG. 46. DIAGRAM OF CENTRAL DISK AND A RAY OF STARFISH Fig. 44.—Brachiopoda, a representative of the second type of the phylum Mollus- coidea. The calcareous shells of these animals much resemble shells of bivalve MoUusca (Fig. 51). Fig. 45.—Echinodermata. Upper or dorsal view of a common starfish. Fig. 46.—Diagram of the internal structure of the central disk and a single ray of a starfish
Elements of biology, with special Elements of biology, with special reference to their rôle in the lives of animals elementsofbiolog00buch Year: 1933 MOUTH FOOT WATER-yASCULAR SrSTEM FIG. 47. SEA URCHIN FIG. 46. DIAGRAM OF CENTRAL DISK AND A RAY OF STARFISH Fig. 44.—Brachiopoda, a representative of the second type of the phylum Mollus- coidea. The calcareous shells of these animals much resemble shells of bivalve MoUusca (Fig. 51). Fig. 45.—Echinodermata. Upper or dorsal view of a common starfish. Fig. 46.—Diagram of the internal structure of the central disk and a single ray of a starfish. Actually the stomach is very much larger than represented and occupies most of the coelom. Note the tubular character of the digestive canal and the radially arranged water vascular system. Fig. 47.—External appearance of the dorsal region of a sea urchin, a repre- sentative of the phylum Echinodermata. Its internal structure is similar to that shown in Fig. 46.
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