. Elements of zoölogy. Zoology. Fig. 73.—Section of dorsal or back eye of Onchidium ver- ruculatum. f, fibrous layer of retina ; s, layer of rods and cones inclosed in retina. pore on the mantle, while the eggs of Arion are luminous for the first fifteen days. Marine Pulmonata. — The Peronia frequents the sea- coast. The most remarkable form is the Onchidium (Fig. 72), that, according to Sem- per, has numerous eyes upon its back (Fig. 73) in addition to the usual pair upon the head. They form the princi- pal food of a fish, the Periop- tkalmusy that leaves the water and hops along the shore to
. Elements of zoölogy. Zoology. Fig. 73.—Section of dorsal or back eye of Onchidium ver- ruculatum. f, fibrous layer of retina ; s, layer of rods and cones inclosed in retina. pore on the mantle, while the eggs of Arion are luminous for the first fifteen days. Marine Pulmonata. — The Peronia frequents the sea- coast. The most remarkable form is the Onchidium (Fig. 72), that, according to Sem- per, has numerous eyes upon its back (Fig. 73) in addition to the usual pair upon the head. They form the princi- pal food of a fish, the Periop- tkalmusy that leaves the water and hops along the shore to obtain them. Value.—All slugs are scaven- gers. Several kinds are dried and eaten by the Indians. Class II.—SCAPHOPODA. Tooth-Shells (Dentaliadce).—These headless mol- lusks have a tooth- or tusk-shaped shell (Fig. 74), open. Fig. 74.—1, Dentalium entalis, natural size ; 2, shell magnified, and broken to show animal within; 3, animal projecting from the shell; 4, animal from below, magnified; 6, same from above; 5, same, showing internal 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 Holder, Charles Frederick, 1851-1915; Holder, Joseph Bassett, 1824-1888, joint author. New York : D. Appleton and company
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
