4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 9I 



specimens is added to the other differences a further reason for specific 

 separation is apparent. Under the circumstances, therefore, it seems 

 best to separate the Atlantic specimens under a new name, which I 

 propose as P. atlanticus. When more material is available from in- 

 termediate waters, it may be possible to unite all these species under 

 one name and regard them as races or varieties of a single widely dis- 

 tributed deep-sea species. 



PARALOPHOGASTER ATLANTICUS, n. sp. 



Text figs. I and 2 

 P. glaber, Tattersall, 1926. 



Localities. — Serial numbers 27, 173, 175, 321, 383, 444, 495, 567, 

 573. 730- 



Fig. I. — Paralophogaster atlanticus, n. sp. Dorsal view of anterior end to show 

 the rostral plate, eyes, antennular peduncle and antennal scale. X 50. 



Description. — Agreeing with the description and figures given by 

 Hansen (1910) for P. glaber except that (i) the rostral plate is 

 tridentate, more distinctly so than in P. glaber, the lateral teeth are 

 more prominent and more on a level with the median tooth, the lateral 

 margins curved (fig. i) ; (2) the antennal scale is three and one-half 

 times as long as broad and one and one-half times as long as the an- 



