286 CR USTA CEANS. 



Leaf-Footed Group,— Order Phyllopoda. 



Some of the members of this group are relatively large, the body being lono- 

 and composed of a great number of segments, of which the thoracic, and sometimes 

 the abdominal, are furnished with leaf -like gill-bearing appendages. 



the glassy leptodora, Leptodora hyalina (enlarged 12 times;. 



scale-tailed apus, Lepidurus (nat. size 



