286 
CRUSTACEANS. 
Leaf-Footed Group,— Order Phyllopoda. 
Some of the members of this group are relatively large, the body being long 
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, Lejoidurus (nat. size). 
