4 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. IIO 



Stephensen ^, Nicholls ^, and others. Schellenberg has produced a 

 key which, as Nicholls remarks, "has made the task of separating 

 members of the various genera a comparatively simple one." The 

 species which I am here describing, while obviously a member of 

 the Pontogeneiidae, does not possess a combination of characters 

 agreeing with any of the genera as keyed by Schellenberg. In the 

 present species the fourth joint of the second antenna is longer than 

 the fifth ; the carpus of the gnathopods is not elongate ; the fourth 

 coxal plate is very shallowly excavate ; the telson is cleft to base ; and 

 the branchiae are not simple but rather complex. 



PONTOGENEIA BARTSCHI new species 



Figure i 



Station 30, about 50 specimens; station 48, about 50 specimens; 

 station 49, about 50 specimens ; station 52, about 25 specimens ; sta- 

 tion 78, about 50 specimens ; station 88, 5 specimens ; station 89, about 

 100 specimens; station 100, many thousands of specimens. 



Male. — Head with very short rostrum ; lateral lobes broadly round- 

 ing; eye very large and black. Antenna i shorter than 2; first joint 

 nearly twice as long as second, which is twice as long as third ; first 

 peduncular joint bearing only groups of very fine setae on under sur- 

 face ; second peduncular joint bearing calceoli on its under surface ; 

 third peduncular joint is without accessory flagellum, but is expanded 

 distally on the inner side into a shallow lobe bearing a few calceoli ; 

 flagellum long and slender and composed of many joints, each of 

 which bears a calceolus and two or three sensory filaments on its under 

 distal edge. Antenna 2, fourth joint longer than fifth and both with 

 calceoli on the upper surface ; flagellum composed of many joints, each 

 of which bears a calceolus and two sensory filaments on its upper 

 distal edge. 



Mandible normal, cutting edge rather narrow and armed with short 

 blunt teeth ; accessory plate small, simple, and armed with short teeth ; 

 three spines in spine row ; molar strong ; palp strong, second joint 

 longer than third and somewhat expanded. Maxilla i, inner plate 

 small and bearing 3 distal plumose setae ; outer plate bearing 1 1 spine 

 teeth; second joint of palp armed distally with 4 slender teeth and 



2 Stephensen, K., Crustacea from the Auckland and Campbell Islands. Vidensk. 

 Medd. Dansk Naturh. Foren., Bd. 83, pp. 315-342, 1927. 



3 Nicholls, G. E., Australian Antarctic Expedition 1911-14, Scientific Reports, 

 Ser. C, Zoology and Botany, vol. 2, pt. 4, Amphipod Gammaridea, pp. 100-122, 

 1938. 



