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PROCEEDINGS OF THE NATIONAL MUSEUM 



In reexamining the considerable numbers of specimens at pre- 

 sent referred to these two species in the collections of the U.S. 

 National Museum, I have failed to find any really constant characters 

 upon which they can be separated. The form of the antennular 

 lamina is almost precisely the same in all (fig. I, a J); the spinulation 

 of the carapace is extremely difficult to make out and in a few instances 

 does not correspond with the geographical distribution of the species 

 as laid down by Tattersall. For instance, specimens from station 



Figure 1. — a-b, Lophogaster longirostris Faxon, type: a, antennular lamina; b, apex of 

 telson. c-e, Lophogaster longirostris, paratypes: c, antennal scale; d, wing of carapace; 

 e, telson. f-h, Lophogaster americanus" from Albatross station 2403:/, antennular lam- 

 ina; g, wing of carapace; h, apex of telson. (Identified by W. M. Tattersall.) 



