no. 1654. AMPHIPODA FROM WEST VORTH IMERJCA UOLME8. 5QQ 



AMPELISCA PLUMOSA, new species. 



Female. — Corneal Lenses absent, Head about as long as the firs! 

 three thoracic segments. First antennae about half the Length <>f the 

 second: second joint about twice Length of first; fiageilum three 

 ■mes Length of peduncle. Second antenna? as Long as the body; a 

 laminate process below base of peduncle divided into two Lobes the 

 posterior of which is acute; Last joint of slender peduncle two thirds 

 length of preceding one: side plates with Long plumose seta on 

 lower margin; Lnfero-posterior angle of first two pairs with a 

 small tooth. Eland of first gnathopods about as lone; and broad as 



ho, IV -AMPELISCA l-l.i M..SA. l'i:MAI.l\ .;'.. THIRD SBQMEN1 OF TH« IBDOM1 



FOURTH SEGMENT OF TIIK ABDOMEN; 'in,. FIRST QNATHOFOD | /'■. THIRD PERJCOPOD ; />:.. 

 FIFTH PB&BOFOD; '. I 11. si, n ; in,. FIRST DBOFOD J nr- . THIRD i BOPOD. 



carpus; second gnathopods much Longer than first, very slender, the 

 carpn- about twice the Length of the narrow hand. Dactyl of the 

 fir>t two perseopods fully as Long as the two preceding joint- com 

 lined. Third and fourth perseopods with h\\ setae and no spines 

 except on distal end of carpus. Basal joint of Last perseopods pro 

 puced downward only to end of following joint; merus scarcely 

 longer than ischium, and produce. I downward both in front and 

 behind: the two following joints of subequal Length and slightly 

 longer than the straight dactyl. 



