. Elements of zoölogy. Zoology. AIR-BREA THING GASTEROPODS. 65 shell-less except when very young. Eolis and Tritonia have been heard to make audible sounds. The eggs of Doris. Fig. 68.—Naked-gilled mollusca, commonly called sea-slugs. D, Doris pilosa ; E, Eolis coro7iata ; f, foot; g, breathing-gills ; t, tentacles. are incased in a ribbon and rolled up like a watch-spring; 360,000 young are often produced, that are at first free swimmers. Air-breathing Gasteropods (Pulmonatd). General Characteristics.—Mollusks possessing a single lung, a chamber on the right side of the body near the head, li
. Elements of zoölogy. Zoology. AIR-BREA THING GASTEROPODS. 65 shell-less except when very young. Eolis and Tritonia have been heard to make audible sounds. The eggs of Doris. Fig. 68.—Naked-gilled mollusca, commonly called sea-slugs. D, Doris pilosa ; E, Eolis coro7iata ; f, foot; g, breathing-gills ; t, tentacles. are incased in a ribbon and rolled up like a watch-spring; 360,000 young are often produced, that are at first free swimmers. Air-breathing Gasteropods (Pulmonatd). General Characteristics.—Mollusks possessing a single lung, a chamber on the right side of the body near the head, lined with a membrane containing blood-vessels. The cavity is closed by a valve. The shell, when present, is gen- erally thin and deli- cate, and often highly colored. Pond-Snails „ r ,-,-,,. , • 7 \ rp. Fig. 69.—a, egg capsule of a fresh-water {LimncBtdcE). — These snail. ^ ^ eggs> Mghly magnified> show- are the common pond- ing the young 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
