12 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 9I 



Most closely allied among known species to P. longispatha Goode 

 and Bean, but differing widely in the much broader and heavier head 

 and snout, the shorter and broader rostral processes, the wider inter- 

 orbital, the absence of a strong emargination near the posterior termi- 

 nation of the cephalic flange, and the color. Named for Dr. Paul 

 Bartsch, director of the Johnson-Smithsonian Deep-Sea Expedition. 



