. An introduction to zoology : for the use of high schools . HIGH SCHOOL ZOOLOGY. 199 A cominon form in spring pools is Braiichipus vernalis (Fig. 125), with eleven pairs of suchlegs ; an allied genus, Artemia, isveiy common in salt lakes. Othergenera are protected by a shell, whichmay be horse-shoe shaped as in Apus,or formed of two valves as in Estheria. Such shells are also foundin another group of Phyllopods—the Cladocera or water-fleas—?(Fig. 126), in which there are only five pairs of legs, but which. Fi^. 125.—Branchipus vernalis,swimming on its back. x 3.

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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1889