192 STALK-EYED CRUSTACEA 



pair of legs prominent and strongly granulate The 

 granules of the inner margin of the fourth joint extend 

 upon the upper surface of the distal half. There are two 

 spines on fifth joint. 

 Brazil, Santa Cruz. 



2. Callinectes bocourti. 



Callinectes bocourti . . A'. Milne Edwards. 



The lateral horns are short. The verges of the male 

 are long, and reach the extremity of the abdomen. The 

 fourth joint of the sternal plastron has, in the middle line, 

 a wide groove which extends as far as the ridge placed 

 between the base of the external maxillipedes, and divides 

 these into two distinct parts. 



Range. — Nicaragua, Honduras, Panama, Brazil. 



3. Callinectes cayennensis. 



Calli)icctcs cayennensis . A. Milne Edwards. 



The lateral horns are short, and scarcely exceed the 

 other teeth of the antero-lateral border ; carapace is not 

 very granular. The first joint of the sternal plastron has 

 a groove in the middle line. 



Range. — Guiana. 



The colour of the species found in British Guiana, and 

 examined by me when they were alive, varies much, and 

 may be any colour from yellow-red to black, passing 

 through many shades of chestnut brown. The lighter 

 coloured crabs are usually found in fresh or nearly fresh 

 water, while the darker and black ones are found in tidal 

 waters of the river or on the seashore. 



