. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. VERMES. 267 T o ;/. Fig. 220.—Polyzoans: 1. Hornera lichenoides, natural size. 2. Branch of the same, magnified. 3. Discopora Skenei, greatly enlarged. more convex; but they are symmetrical, i. e., a vertical line let fall from the hinge divides the shell into two equal parts. The ventral valve has, in the great major- ity, a prominent beak, perforated by a foramen, or hole, through which a fleshy foot protrudes to attach the ani- mal to submarine rocks. T
. Comparative zoology, structural and systematic : for use in schools and colleges. Zoology; Anatomy, Comparative; Physiology, Comparative. VERMES. 267 T o ;/. Fig. 220.—Polyzoans: 1. Hornera lichenoides, natural size. 2. Branch of the same, magnified. 3. Discopora Skenei, greatly enlarged. more convex; but they are symmetrical, i. e., a vertical line let fall from the hinge divides the shell into two equal parts. The ventral valve has, in the great major- ity, a prominent beak, perforated by a foramen, or hole, through which a fleshy foot protrudes to attach the ani- mal to submarine rocks. The valves are opened and shut by means of muscles, and in most cases they are hinged, having teeth and sockets. 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 Orton, James, 1830-1877; Birge, E. A. (Edward Asahel), 1851-1950. New York : Harper & Bros.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1883
