486 STALK-EYED CRUSTACEA 



2. Bithynis aztecus, 

 Palcsmon astecns .... Saussure. 



Rostrum short, elevated, its superior border bowed, its 

 apex sharp, its inferior border convex, being as long as 

 the peduncle of the internal antennae ; there are thirteen 

 teeth above and three or four below. The legs of the 

 second pair are of moderate length, fifth joint short ; hand 

 three times as long as it, almost cylindrical ; fingers 

 cylindrical, about as long as the palm. Swimming organ 

 of moderate size, rounded, and having on each side a large 

 spine preceded by a small one. 



Range. — Gulf of Mexico. 



3. Bithynis montezumae. 



Palcsnion inontezumce .... Saussure. 



Rostrum long and narrow, ending in two teeth one 

 above the other, as long or longer than the peduncle of 

 the internal antennae, armed above with ten to twelve 

 teeth and with three or four teeth below. Legs of the 

 second pair short, thin, cylindrical, fifth joint short ; hand 

 three times as long as it. Swimming organ terminates 

 in a tooth which is armed with two teeth on each side. 



Range. — Gulf of Mexico. 



4. Bithynis brasiliensis. 



Palcuuion brasiliensis Heller, Miers, Von 



Martens. 



The second pair of legs about of a size ; the palm is 

 but little longer than the fifth joint ; no teeth on inner 

 margin of fingers ; sides of carapace below hepatic spines 



