. Introduction to zoology; a guide to the study of animals, for the use of secondary schools;. gth of about10 centimetres and has a light brown color, marked withlongitudinal rows of black spots along the back and sides. This species was almost un-known in this country untilthe middle of the sixties, butit is now widespread through-out the East. It has doubt-less been introduced from thecontinent of Europe, whereit is very abundant. Second,Limax ay rest is1 is usuallyabout centimetres long ;it varies in color from whitishthrough gray to black. It isnow common in the easternUnited States, b
. Introduction to zoology; a guide to the study of animals, for the use of secondary schools;. gth of about10 centimetres and has a light brown color, marked withlongitudinal rows of black spots along the back and sides. This species was almost un-known in this country untilthe middle of the sixties, butit is now widespread through-out the East. It has doubt-less been introduced from thecontinent of Europe, whereit is very abundant. Second,Limax ay rest is1 is usuallyabout centimetres long ;it varies in color from whitishthrough gray to black. It isnow common in the easternUnited States, but is believedto have been introduced fromEurope. Third, Limax cam- genera figured are: A, Actaeon; pestris? a native species, isB, Aplustrum; C, Cylicbna; D, , , Atys; E, Phiiine; F, Doiabeiia; smaller than agrestis, and its tuberosities are not somuch flattened or occurs widely distributedeast of the Rocky Mountains. Economically, slugs are of importance because at timesin some localities they cause much destruction in gardens 1 Living in the field. 2 Living in open FIG. 149. — Illustrating the transi-tion of form in the shell of certainOpisthobranchs, from the pointedspiral to the almost tiat plate. The G, Aplysia; //, to various scales. FromCooke, Mollusca. THE SLUG AND IM ALLIED 168 . ep- and greenhouses. Particularly in Europe, Limax agrestishas often devastated fields of young shoots ; this speciesis especially fond of bulbous plants. In the apparent absence of a shell the slug seems to bean aberrant gastropod. Other land gastropods — thesnails — have an evidentshell. In Limax the shellis reduced to a thin, horny ^ Jplate, embedded in themantle. Between the con-dition seen in the snailand that in Limax thereare intermediate condi-tions, in which the largeshell is partly covered bythe mantle, and othersin which the shell hasbecome reduced in allies of Limax -
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1900
