426 STALK-EYED CRUSTACEA 



There are strong spines, more or less curved, on the 

 posterior margin of the swimming organ. Gills are 

 attached to the membranous joints of the first four 

 pair of legs, and to the first joint of the external 

 maxillipede. 



Range, — West Indies, Arafura Sea; in deep 

 water. 



I. Cheramus occidentalis. 



CJicrainiis occidentalis . . . Spence Bate. 



Carapace smooth, with a sharp rostrum reaching 

 nearly to the extremity of the legs. Branchial region 

 defined from the gastric. The telson is long, quadrate ; 

 the posterior margin, rather narrower than the anterior, 

 is fringed with long ciliated hairs, and has in the middle 

 line a strong sharp tooth, and two short sharp spines on 

 the posterior half of the lateral margin. 



Range. — West Indies. 



Family II. Thaumastochelidae. 

 TJiamnastochclidcE .... Spence Bate. 



The carapace, ovate and smooth, projects to an 

 anteriorly flattened point or rostrum. The internal 

 antennae have two long flagella ; the external antennae 

 have a scale at the base. The first pair of legs chelate, 

 large; the hand, terminating in long slender fingers, sub- 

 equal, somewhat unsymmetrical. Second pair chelate, 

 symmetrical, subequal, small. The abdomen has the 

 basal joint of appendages well defined. The swim- 

 ming organ has the outer plate much larger than the 

 inner. 



Range. — West Indies. 



