ggQ CRUSTACEA. 



ceding joint. First and third pairs of stylets, extend equally far 

 backward, the second pair less far. The mandibles have a three- 

 jointed palpus, and the last joint is falciform and short pectinate on 

 the under side, — a common characteristic of the Gammari. The appen- 

 dage to the superior antennae, if one exists (as we suspect), was over- 

 looked. If absent, the characters are those of an Iphimedia, although 

 more like Gammarus in habit. The maxillipeds are hairy within, 

 and have a long spine or claw at apex. The species is near the Q. 

 orasiliensis in many characters. 



Amjphithoe peruviana, Dana, Proc. Amer. Acad. Sci., Boston, ii. 215. 



Gammarus? pubescens. 



Corpus compressum, sparsim pubescens, epimeris sat rnagnis. Oculi sub- 

 reniformes. Segmentum corporis caudate brevius, emarginatum. An- 

 tennae Imce dimidio corporis longiores, 2dis fere duplo longiores bad 

 vix breviore quam fiagellum, articulis prirno secundoque subcequis, 

 longis, setis numerosis longiusculis ; 2dce dense Mrsutce, basi lmarum 

 paulo longiores, basi fere duplo longiore quam fiagellum. Pedes lmi 

 parvuli, manu angustd, supra rectiusculd, apice angustiore, infra Ur- 

 sula. Manus secunda grandis, oblonga, supra rectiuscula, versus 

 apicem angustans, infra hirsuta et obsolete erosa, palmd fere longitudi- 

 nali, non excavatd, digito mediocri. Pedes 6 postici sat longi, subwqui, 

 setis rigidis, articulo lmo lato. 



Body compressed, sparsely pubescent, epimerals large. Caudal seg- 

 ment small, emarginate. Superior antennae nearly three-fourths as 

 long as the body, and almost twice as long as the other pair, base 

 hardly shorter than the fiagellum, first and second joints subequal, 

 long, setae numerous, longish; inferior pair densely hirsute, base 

 much longer than fiagellum, and shorter than base of superior pair. 

 Anterior feet small, hand narrow, nearly straight above, narrowing 

 towards apex, hirsute below. Hand of second pair oblong, large, of 

 same form as hand of first pair, hirsute below, palm nearly longitu- 

 dinal, not excavate nor limited by a tooth or spine, finger of mode- 

 rate length. Six posterior feet rather long, subequal, setae rigid, 

 first joint broad. 



