40 BULLETIN" 71, UNITED STATES NATIONAL MUSEUM. 



fathoms, H 4476 in 438 fathoms, H 4566 in 572 fathoms, and H 4590 

 in 978 fathoms. 



So far as I have observed in the material I have examined this 

 species has occurred but once, Nero station 190 in 864 fathoms near 

 Midway Islands. It should be noted, however, that most of the 

 material I have had has come from deep water and little of it from 

 shallow water in the Tropics where this species is mostly found. 



There seems to be but one living species of this genus. 



