File:Image from page 152 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14598297740).jpg

Identifier: introductiontozo00dave Title: Introduction to zoology; a guide to the study of animals, for the use of secondary schools; Year: 1900 (1900s) Authors: Davenport, Charles Benedict, 1866-1944 Davenport, Gertrude Anna Crotty, 1866- Subjects: Zoology Publisher: New York, Macmillan company London, Macmillian and co., ltd. Contributing Library: MBLWHOI Library Digitizing Sponsor: MBLWHOI Library

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Text Appearing Before Image: testine straight . . SididcK b-2. 5 (or 6) pairs of feet, the anterior pair moreor less prehensile and destitute of branchiae.Ci- Ranii of antennae 3- and 4-jointed; 5pairs of feet, the last with a curvedappendage guarding the branchial sac ;antennules of the female sort, 1-jointed Daph nidus 132 ZOOLOGY Co. 0 pairs of feet ; an ten miles elongated, many-jointed . . . . Cg. Antennae with both ranii o-jointed ; in- testine convolute ..... Body wholly or nearly destitute of a bivalve shell ; feet not branchiate, spiny ; abdomen curved, ending in two long stylets BosminidceLynceuhe Polyphemidce CHAPTER IX THE EARTHWORM AND ITS ALLIES Relationships.- -Earthworms1 belong to an order ofAnnelids known as Oligocheeta.2 This group is distin-guished by a prevailingly non-marine life, by the absenceof parapodia, by few bristles, and by the absence of tenta-cles, palps, cirri, and gills.3 Habits. — Earthworms, as the name implies, are inhabit-ants of the ground, through which they burrow and in

Text Appearing After Image: FIG. 122. — Flash-light photograph of earthworm and slug crawling on a pave-ment at night. Photo, by D. and S. 1 There are not very many kinds of terrestrial Oligochseta. The prin-cipal American species may be distinguished with the aid of the key givenin the Appendix to this Chapter. - 6X1705, few ; XCUTT?, hair. 3 The Oligochfeta exhibit two principal subdivisions ; the first of whichincludes terrestrial species of the single family Lumbricidse, and thesecond various aquatic families, — a key to which is given on page 144, ] 33 134 ZOOLOGY which they gain their food. They sometimes come to thesurface at night in search of companions and food (Fig.122). Even during the day in rainy weather they extendthe anterior end of the body out of their burrows. Earth-worms, found on the surface at other times, have, for themost part, been parasitized by a fly, and are in consequenceweak or dying. During the daytime, if the surface mois-ture permits, they lie near the mouth of their burrows,

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