17tl AMPHIPODA NORMALIA. 



joint slender ; third short, slender ; flagellum as long as the pe- 

 duncle ; secondaiy appendage consisting of one long and one short 

 articulus. Inferior antennae having the fourth joint of the peduncle 

 reaching beyond the extremity of the peduncle of the superior. 

 Fir.st pair of guathopoda (imperfect) : second pair- liaving the carpus 

 and propodos subequal in length, and fringed with a few not very 

 long hairs ; dactylos straight, about one-thii-d the length of the 

 propodos. First two pairs of perciopoda long and slender, having 

 the dactylos short, about one-third the length of the propodos ; 

 basa of the three posterior paii'S of pereiopoda but slightly dilated 

 posteriorly, and narrowiiig distally. Ante- and penultimate pairs 

 of pleopoda fui-nished with a few spines along the upper margin. 

 Telson double, each portion having a siibapical emargination, from 

 the bottom of which spiings a solitary cilium. Under the micro- 

 scope the integument is covered -with small opaque spots. 

 Length ^tt^s of an inch. 

 Hab. Banff (Mr. Edward). 



This species is named in compliment to Mr. Adam White, of the 

 British Museum, author of a popular ' History of the British Crus- 

 tacea.' 



5. Protomedeia pinguis, n. s. (Plate XXXI. fig. 3.) B.M. 



Ptilocheirus pinguis, Stimpson, Marine Invert, of Cfrand 3fanan,^. BH. 

 Male. — Eyes small, oblong, narrow, black. Superior antennse half 

 as long as the animal, having the peduncle as long as the flagel- 

 lum ; secondary appendage one-third as long as the flagellum. 

 Inferior antennae nearly as long as the superior, having the 

 peduncle longer than the peduncle of the superior. First pair of 

 gnathopoda having the cai-pus as long as the propodos ; propodos 

 gradually but slightly enlarging to the palm, which is straight, 

 and defined at the inferior angle by a short stout spine ; dactylos 

 short, stout, cui-ved : a row of long, closely set haii's fringe the 

 inferior margin of the ischium, of the meros, as well as that of the 

 cai-pus ; a few short, stifl", ciu-ved hairs, regularly increasing in 

 length, also fringe the inferior margin toAvards the anterior ex- 

 tremity of the propodos. Second pair of gnathopoda slender; 

 carpus very long, more than as long again as the propodos, carry- 

 ing a brush of long plumose hairs upon the anterior extremity of 

 the superior margin ; propodos scarcely as broad as the carpus ; 

 superior margin straight, fringed ■\\-ith a row of long plumose 

 haii-s, the inferior margin gradually tapering and fringed Avith 

 fasciciili of short haii's. Fii'st two pairs of pereiopoda uniform, 



