480 COROPHIID.E. 



form of the inner ramus of each of those caudal ap- 

 pendages which are normally developed, and the greater 

 length of their spines ; " the fundamental character of 

 both are, however, uniform. 



The name of Cyrtophium is preferred to the one which 

 Dana more fully described, in consequence of its having 

 been applied to an European species, previously to our 

 having determined that the two were congeneric. 



This genus will probably be found to have a large 

 geographical range, since, although but few specimens 

 have hitherto been found, their habitats have been widely 

 apart. 



Cyrtophium Brasilieuse was dredged by Dana in the 

 harbour of Rio Janeiro, while he took C. orientale at 

 Singapore in the East Indies. C. tuherculatus has been 

 dredged by Bruzelius on the coast of Norway, and the 

 British species is not rare on the southern coast of 

 England. 



