ho.1654. AMPHIPODA FROM WEST VORTH IMERICA HOLMES. 499 



nearly transverse palm with spines ai the p< sterior angle. Hand of 

 second gnathopods over half as long as the carpus, nearrj rectangu- 

 lar; palm nearly transverse. Merus of first two pereopods wide and 

 produced at the lower anterior angle; carpus about two-thirds as long 

 ;i> the propodus, which i- nearly as long as the merus; dactyl aboul 

 half as long as the preceding joint. Merus of third peraeopods ex 

 panded, that of the fourth pair less so; while in the lasl pair the 

 merus is scarcely wider than the carpus; dactyl about half the length 

 of the propodus in the third pair and aboul one-third the length of 

 the propodus in the la>t pair. Fifth pair of coxa! plate- a little 

 broader than deep. Third abdominal segment with the infero pos 

 terior angle produced into a rather short triangular t<>oth. Fourth 

 segment with a dorsal sinus near the anterior end behind which is a 



Fig. ;». Lakota carinata ". raiRD abdominal segment; gnu first qnathopod; ■/»,. 

 BBCOND gnathopod; ni'l. mammi'.i.i:; mwp, m \xiu.iri:i> ; /. TELSON ; in... BHCONP 1 ropod; 



lira, I'll [RD I ROPOD. 



gently arched carina. First uropods extending beyond the second but 



not the third pair: rami equal, about two-third- a- long a- the pedun- 

 cle, lanceolate, and armed with several spines. Rami of second peraeo 

 pod- about as long a- the | »»■< I uncle, armed with several -pine-, inner 

 ramus slightly shorter than the outer with a constriction <>r incision 

 ;,t the posterior third, just in front of which i- a prominence bearing 

 a large spine; a smaller constriction beyond the last -pine on the outer 

 ramus. Third uropods with the inner ramus slightly shorter than 

 the outer, but reaching beyond the first joint ; terminal joint of outer 

 ramus narrowly conical, inner margins of both rami with plumose 

 Setae; inner ramus with three -pine- on the inner and two on the outer 

 margin; outer ramus with five -pine- or pair- of -pine- on the outer 

 margin and none on the inner, except at the end of the first joint. 



