THE LANTERN FISHES. 



223 



with specimens of the latter from the Atlantic Coast of the United States 

 off Cape Hatteras shows that the two are distinct. R. tenidculus has a much 

 larger head, with deeper, blunter, scarcely protruding snout, and much 

 larger eye. The mouth is smaller compared with length of head. The 

 upper profile is much more curved than the lower, the two nearly equally 

 curved in coccoi. In the single specimen before us, the ventral fins contain 

 but seven rays, as in Garman's type, while in all specimens of R. coccoi which 

 we have examined there were eight ventral rays ; no outer rudimentary 

 ventral ray could be detected in either form. Scales along dorsal and 

 ventral outlines produced and narrowed backward, terminating in an acute 

 point which is more pronounced in R. tenuiculus than in R. coccoi. 



For purposes of comparison, there is given below a table of comparative 

 measurements of R. tenidculus and R. coccoi in hundredths of total length 

 without caudal. 



