File:Image from page 265 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14598548507).jpg

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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: FIG. 22l>. —Petromyzon, the lamprey. One-fourth nat. size. After Goode. The Cyclostomi, or lamprey eels, are the only parasiticvertebrates. In the adult stage they either live attached 246 ZOOLOGY to the outside of other fishes, sucking their blood, or else they may penetrate intothe body cavity. Theydo not bite, because theyhave no lower jaw, andare known as round-mouthed eels.1 Lam-preys are found in the seasand in the rivers of thetemperate zones. Theyoccur on our Easterncoast and ascend rivers ;others live in the lakes ofNew York, in the GreatLakes, and in the Missis-sippi valley. In Europethey are much esteemedas food. The Selachians includethe sharks and rays, allinhabitants of the sea.They may be distin-guished from the bonyfishes by the rough skin,beset with spines, and bythe cartilaginous skele-ton. We have a num-ber of sharks on ourNortheastern coast, ofwhich the dogfishes andthe sand-shark are the i Fig. 229.

Text Appearing After Image: THE SMELT ANU ITS ALLIED 247 commonest (Fig. 230). They are all carnivorous animalsand powerful swimmers. They feed on the larger Crus-tacea and fish. The living Ganoidei are a remnant of a very extensivegroup which existed in geological times. North Americais especially rich in existing representatives of this group,as of several other old groups, such as the turtles, tailedamphibians, and the king-crab. Of the five families ofganoids, four are represented in this country. In thefollowing four paragraphs we shall consider a type of eachof the native families. The sturgeons have five rows of bony scales on thetrunk and four barbels on the head.1 They occur both


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