File:Image from page 149 of "Introduction to zoology; a guide to the study of animals, for the use of secondary schools;" (1900) (14804854053).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: re K 130 ZOOLOGY sessile and enclosed in shells ; but their peculiar habitshave given rise to certain peculiarities in reproduction.They are hermaphroditic; i.e. both male and female germ-cells occur in the same individual. Despite this fact,dwarf male individuals are occasionally found inside theshell of the barnacle ; these are known as complementalmales. The general form of the barnacles has also be- come greatly modified by theirsessile habit, so that theywere long regarded as mol-lusks, until it was shown thatthe larvje are almost exactly i/ like those of other Ento-mostraca. Trilobites1 are extinct giantEntomostraca, closely alliedto Branchipus. They wereimmensely abundant in earlygeologic times, and their re-mains form a large part ofcertain rocks. They had asegmented body, with bifidappendages and long antemue, T ,1 T - 101 . , ,. and their compound eyes were FIG. 121. — A restoration of the J borne on the great frontaleld. Some of them wereBeecher. nearly half a metre long.

Text Appearing After Image: ventral aspect of a Triiobite. 1 Having three lobes. APPENDIX TO CHAPTER VIII 131 APPENDIX TO CHAPTER VIII KEY TO THE FIVE ORDERS OF ENTOMOSTRA.CA a\. Free-living or parasitic inhabitants of the sea or of fresh water.?>i. 2 pairs of maxillae. ti Mandible without palp ; 4 or more pairsof foliate swimming legs behind maxillae[Phyllopoda].di. With 10 to 40 pairs of legs . . Sranchiopoda (Ex. Branchipus) (Z2. With 4 to 6 pairs of legs . . . Cladocera (Ex. Daphnia) Co. Mandible with leg-like palp ; only 2 pairs of appendages behind maxillae . . Oatramiltt 60. Only 1 pair of maxillae, followed by 4-5 pairs of bifid, oar-like feet; often deformed as a result of parasitism Copepnda (Water-fleas) «o. Sessile marine animals, whose body is surroundedby a usually calcified mantle ; 6 pairs of tendril-like feet Cirripedia (Barnacles) Key to the principal families of Cladocera, to which group Daphniabelongs : — a\. Body enclosed in a bivalve shell ; mandibles trun-cate below ; maxillae distin


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