no. lor,*. IMPHIPODA FROM WEST WORTH AMERICA— HOLMES. 515 



ment is not so prominent nor the margin above il so strongly sinu- 

 ous: the dactyls of the first two perseopods are longer, and the tel- 

 son has a very different extremity. It is distinguished Prom most 

 species of the genus, except brevicornis, by the very lame Lobe on the 

 posterior side of the merits of the last perseopods. In a male speci- 

 men from Station 1549 the anterior elevation on the dorsal side of 

 the fourth abdominal segment was acute and the posterior one more 

 prominent than in the other specimens examined. The terminal 

 uropods are about the same in the two sexes, except that the rami 

 are somewhat broader in the male. The species also resembles A. 

 pugetica Stimpson, but the last three abdominal segments can scarcely 

 be said to be "separated from the preceding ones by a deep notch." 



AMPELISCA CCECA, new species. 



Eye- absent. First antennae but little longer than the peduncle of 



the second: the peduncle not reaching the middle of the antepenul- 



FlO. 24. — AMPELISCA CCECA. aft . IHIKI" SEOMKNI OF Tin: ABDOMEN | nh,. FOOBTH BEG 

 MENT OF THE ABDOMEN; !/"\- FIRST QNATHOPOD ; i/llj. SECOND QNATHOPOD J /»,. FIBS'J 

 PEBSOPOD; l>t- PODBTH PBBSOPOD J /'-,. FIFTH PEB.SOPOD ; t, TELSON ; Ufa, THIRD UBOPOD. 



timate joint of the peduncle of the second pair: lirst joint over half 

 as thick as long and about half the length of the second; llagellum 

 about eighteen-j ointed. Second antenna' about as long as the body: 

 the last two joints of the slender elongated peduncle of subequal 

 length. 



