. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. 216 ZOOLOGY Fig. 203. — Plaiior- bis, the pond snail. Nat. size Photo, by W. H. C. P. lives ill a similar habitat with Physa. A great many species are known, and they vary much in size. Snails of this genus likewise are easily kept in the aquarium, and lay numerous eggs encased in gelatinous envelopes adhering to the glass. Of the shells of marine gasteropods, which are favorite objects in collections because of their beauty and permanence, only a few types can be mentioned. Lit'torina ^ is an
. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. 216 ZOOLOGY Fig. 203. — Plaiior- bis, the pond snail. Nat. size Photo, by W. H. C. P. lives ill a similar habitat with Physa. A great many species are known, and they vary much in size. Snails of this genus likewise are easily kept in the aquarium, and lay numerous eggs encased in gelatinous envelopes adhering to the glass. Of the shells of marine gasteropods, which are favorite objects in collections because of their beauty and permanence, only a few types can be mentioned. Lit'torina ^ is an example of the entire- mouthed marine snails. The commonest form at most jiarts of the shore-line north of New York at the present time is Littorina This is known in England as the periwinkle, and is there used as food. As its S3^stematic name implies, it occurs on the seashore, which it often crowds so as to force all other species from it. It occurs north to Greenland, and on the northwestern European coast. It has not always occupied our shores, but has been migrating southward. In 185-5 Littorina was found in the Gulf of Saint Lawrence ; in 1869 it was stated to occur in HaHfax ; in 1870 a few individuals were found on the Maine coast; during 1871 the species occurred on the New Hampshire coast; in 1872 one specimen was found at Salem, Massachusetts ; in 1875 the first two specimens were taken at Woods Hole, Massachusetts, south of Cape Cod ; in 1880 the first specimen was taken at New Haven ; in 18!)1 it occurred as far south as Delaware Bay. In 1899 it was not very abundant at 1 Fig. 204. 2 Ffoni iillus, the Fio. 204.—L/«i)riiio /i7- lorca, the shftre snail. Nat. sizo. Photo, hy \y. H. c. 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 Davenport, Charles Benedict, 1866-1
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1911
