232 STALK-EYED CRUSTACEA 



is not armed with teeth ; the fifth has three curved teeth 

 on inner margin. The lateral borders of carapace, which 

 is almost quadrilateral, is armed with four flat, equal 

 sized teeth, counting the external orbital angle. The 

 whole body and legs are covered with red ring-like spots. 

 The abdomen of the male has six joints ; the second 

 to the fifth inclusive being soldered together ; the third 

 joint is the broadest. 



Range. — Peru, British Guiana. ' 



2. Dilocarcinus emarginatus. 



Dilocarcinus emarginatus . H. Milne Edwards. 



The carapace is almost horizontal ; the front is flat, 

 and two-lobed. The antero-lateral edges are flat, pro- 

 duced, and armed with five large obtuse teeth, counting 

 the external orbital angle. 



Range. — River Amazon. 



3. Dilocarcinus spinifrons. 



Dilocarcinus spinifrons . . J. S. Kingsley. 



Carapace regularly arcuate, regions not indicated, 

 lateral borders armed with four spines, excluding the 

 spiniform external orbital angle ; the margins of the 

 spines serrate. Superior orbital margin crenulate, inferior 

 denticulate, with a strong spine near interior angle. 

 Front prominent, armed with about fourteen spines. A 

 spine at antero-lateral angles of buccal area. 



First pair of legs subequal ; fourth joint with two spines 

 about the middle of posterior margin, a single spine 

 opposite on anterior margin, and a spine on distal portion 

 of upper margin ; carpus has a spine on interior surface ; 



