The Cambridge natural history . h some avidity. Certain food was rejectedby all alike, London Pride, Dog Eose, Beech and Chestnutleaves. Spruce Fir, Conniion Eush, Liverwort, and Lichens : whileall, or nearly all, ate greedily of Potatoes, Turnips, Swedes,Lettuces, Leeks, Strawberries, JBoleUis edulis, and commongrasses. Few of our common weeds or hedgerow flowers werealtogether rejected. Avion and Limax were decidedly lessparticular in tlieir food than Helix, nearly all of them eating-earth-worms and puff-balls, which no Helix would touch. Avion? atev and Limax niaximus ate the slime off
The Cambridge natural history . h some avidity. Certain food was rejectedby all alike, London Pride, Dog Eose, Beech and Chestnutleaves. Spruce Fir, Conniion Eush, Liverwort, and Lichens : whileall, or nearly all, ate greedily of Potatoes, Turnips, Swedes,Lettuces, Leeks, Strawberries, JBoleUis edulis, and commongrasses. Few of our common weeds or hedgerow flowers werealtogether rejected. Avion and Limax were decidedly lessparticular in tlieir food than Helix, nearly all of them eating-earth-worms and puff-balls, which no Helix would touch. Avion? atev and Limax niaximus ate the slime off one another, andportions of skin. Cyclostoma elegans and Hyalinia nitidapreferred moist dead leaves to anything else. II. /Sup-position of Eyes.—In the majority of the head-bearing-]\IollusLa the eyes are two in number, antl are placed on, or inthe immediate neighbourhood of the head. Sometimes they arecarried on projecting tentacles or onnuatophores, whicli areeither simple (as in Prosobranchiata) or capable of retraction. Fig. 86.—A, Livinaea peregra Mtill. ; e, e, eyes ; t, i, tentacles : B, Helix nemoralisMiill. ; e, e, eyes ; t, t, tentacles ; p-o, pulmonary orifice. like the fingers of a glove {Helix, etc.). Sometimes, as in a largenundjer of the marine Gasteropoda, the eyes are at the outer baseof the ceplialic tentacles, or are mounted on the tentacles them-selves, but never at the tip (compare Fig. 60, p. 153 and Fig. 98, ORGANISATION OF THE EYE i8i p. 199). In other cases they are placed somewhat farther Ijack, atthe sides of the neck. The Puhnonata are usually suljdivided intotwo great groups, Stylommatopliora and Basommatoi^liora (), according as the eyes are carried on the tip of the largetentacles {Helix, and all non-operculate land sliells), or placed atthe inner side of their l)ase {Lhnnaea, Plujsa, etc.). In land andfresh-water operculates, the eyes are situated at the outer base ofthe tentacles. In the Helicidae, careful observation will sliow that
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
