264 



TEXTBOOK OF ZOOLOGY 



Section I. Branchiata (brankia'ta, gill) gill-breathing, aquatic 

 forms for the most part. 



Class I. Crustacea, craj^fish, crab, pill bug, barnacle, water flea, 



etc. 



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Subclass Entomostraca, fairy shrimps, water fleas, and barnacles. 

 Order Branchiopoda, fairy shrimp (Branchipus), water flea 

 (Daphnia) . 

 Order Ostracoda, Cypris. 



