A.MPHIPODA. 251 



First uvosome segment with a dorsal depression, not carinate. 



Upper antennae reaching a little beyond the peduncle of the lower; the latter 

 longer than the body. 



First gnathopods strong ; side-plates rounded before, straight behind. First joint 

 widening distally ; wrist and hand subequal, about twice as long as wide, setose. 



Second gnathopods : 1st joint twice as wide at the distal end as any of the 

 remaining joints ; wrist halt' as long again as the hand. 



First and 2nd perseopods : dactylus hardly as long as the two preceding joints 

 (fig. 12. pp. 1 ). 



Third and 4th jieraeopods very short and much alike, except that the upper margin 

 of the membranous posterior lobe of the 1st joint originates from the top of the hind 

 margin in the 3rd, and from lower down in the 4th pair. The 4th joint is broad and 

 produced behind in a truncate lobe, which is scabrous with minute spines, and 

 terminates in a group of unequal spines, of which the longest reaches the end of the 

 5th joint and is denticulate (fig. 12. pp. 1 ). 



Fifth perteopods : hind margin of the 1st joint extending downwards to the end of 

 the 2nd, a few short setse on the lower part of the posterior curve and a long plumose 

 one on the upward recurvature ; 2nd joint the longest and the 3rd the shortest of the 

 remaining joints, neither produced at the angles; 4th and 5th subequal in length and 

 width, the latter ovate; last joint ovate, with a minute point and setule at the end 

 (fig. 12. pp.=). 



First uropods reaching the end of the 2nd pair ; rami curved, rather shorter than 

 the peduncle. 



Second uropods with straight rami considerably shorter than the peduncle, inner 

 ramus finely serrate on the outer, outer ramus on the inner margin. 



Third uropods : rami* nearly twice as long as the peduncle, lanceolate, the inner 

 the wider dentate along the distal half of its inner margin, the teeth increasing in 

 size distally, and 3 or 4 setas near the end of the outer ; outer ramus minutely 

 spinous near the end of the outer margin, with 3 or 4 fine submarginal and a pair of 

 terminal setae (fig. 12. ur.). 



Telson divided to the base and covering a fourth of the length of the rami of the 

 3rd nr< pods ; a notch and spine at the end of each division, a marginal spine just 

 behind the end, and a seta behind the spine. 



Characterized by the spinous 4th joints of the 3rd and 4th perseopods, the form 

 and proportions of the joints of the 5th and the serrate and dentate 3rd uropods. 



Length, 6 millims. 



A. brachyceras,t n. sp. Plate II., figs. 13. 

 Kondatchi Paar, 1 ; Cheval Paar, 1 ; both November, 1902. 



* In the specimen figured the rami are double probably the result of an imperfect moult. 



t In allusion to the shortness of the antenna-. 



2 K 2 



