STALK-EYED CRUSTACEA 483 



which is subcylindrical, and subequal in length with the 

 fifth joint. The first pair of legs extend to about the 

 level of the tip of the rostrum ; the fingers are as long 

 as the palm, and the fifth joint is as long as the palm 

 and fingers. The last segment of the abdomen has three 

 spines. 



Range. — Floating weed, Atlantic and Pacific, Guada- 

 loupe. 



2. Bithynis. 



Bithynis Philippi, Spence Bate. 



Macrobrachium .... Spence Bate. 



Palcsinon (part) .... Dana, H. Milne Edwards. 



Palcenion Stimpson. 



Resembles PalcEnwn. There is one tooth on the 

 anterior margin of the carapace. There is a second tooth 

 behind it, but a little lower down. The second pair of 

 legs is long, cylindrical, and developed, in the male, to 

 a greater length than that of the animal, and more or 

 less unequal. The abdomen is short in proportion to the 

 length of the carapace. 



Range. — Fresh water streams of tropical Asia, Africa 

 and America, or in adjacent seas. 



Synopsis of the Species. 



I. No space between fingers of large hand when 

 closed. 



A. Of the largest leg ^ *~" — ^ 

 the fifth joint is shorter ' ^'^^'^^^^^^^^^"^?^^77r7^rT-rT-rr X / ^ 



than the palm. 



a. Rostrum has six to twelve teeth above and three 



