STALK-EYED CRUSTACEA 485 



I. No space betiveen fingers of large liand zvhcn closed. 

 A . Fifth joint of largest leg sJiorter than palm : — 



I. Bithynis jamaicensis. 



Biihynis janiaicejisis . . Kingsley, A. Milne Ed- 

 wards. 



Palcuion jamaicensis . . H, Milne Edwards, Seba, 



Olivier, Lamarck, Leach, 

 Desmarest, Smith, Saus- 

 sure. 



Palenion carcinus . . . Latreille, Fabricius. 



Astacus fluviatilis . . . Sloan. 



Caniaron dc agna dulce . Parra. 



Cancer astacus jamaicensis Herbst. 



Body stout. Rostrum short, not exceeding the ped- 

 uncle of the internal antennae, slightly sharp, and armed 

 with six to twelve serrated teeth above and with three 

 or four below. External maxillipedes very long, exceed- 

 ing much the peduncle of the external antennae, and 

 reaching almost to the end of their basal scale. Legs of 

 the second pair very long, strong, almost cylindrical, and 

 finely granular ; hands slightly swollen ; pincers almost 

 cylindrical. In large specimens the limbs become spiny, 

 and develop large teeth on the cutting edge of the fingers. 

 The last three pairs of legs are short and stout. Last 

 segment of the abdomen is wide, and terminates in a 

 semicircular border ornamented with hairs and with two 

 lateral spines. 



Range. — West Lidies, Jamaica, Barbados, British 

 Guiana, Gulf of Mexico, Rio San Francisco, West African 

 Coast. 



