coRorniiDj;. 2G1 



catc ; second and third moro slender than tlic first, suheqnal, each 

 loniier than tlie lirst ; tiagelhim a little longer than the last joint 

 of the peduncle. Inferior antcnnic nearly as long as the superior ; 

 last joint of the peduncle longer than the preceding. First pair of 

 gnathopoda small ; carpus and propodos equally together forming 

 an oval, the su])erior margin arcuate, inferior nearly straight, palni 

 not defined ; dactylos arcuate. JSecond pair of gnathopoda longer 

 than the first, having the cai-j)us but slightly produced along the 

 inferior margin of the propodos ; propodos ovate, tapering ; ])alm 

 very oblique, slightly concave, imperfectly defined by a few cilia ; 

 dactylos arcuate, serrated upon the inner side with minute teeth 

 and several eqmdistant larger ones. First pair of pcreiopoda 

 ha\-ing the basos largely dilated, second like the first, third short, 

 fifth and sLxth long ; last three having the basa produced at the 

 disttd extremity to an obtuse angle, and the dactyla serrated on 

 the inner margin and unguiculate. Fourth pair of pleopoda 

 ha\'ing five equidistant spines upon the outer margin of the pe- 

 duncle ; rami having the margins serrated and furnished with a 

 few spines, the inner ramus shorter than the outer and tipped 

 with a single strong spine : fifth pair shorter than the preceding ; 

 sixth pair having the peduncle robust, the ramus terminating in 

 two short, obtuse, cui'ved spines. Telson double-lobed, each lobe 

 armed with several rows of short shai-j) teeth. 

 Length ;7\;ths of an inch. 



Hah. Northumberland {Mr. Alder) ; Oxwich Bay, Glamorgan 

 {C.S.B.). 



5. Dercothoe ? (Cerapus ) productus. 



Dercothoe ? productus, Stimpson, Proc. Acad. Nat. Sci. Philad INIay 

 and July, 185.5. 



" Ophthalmic lobes of the cephalon much produced, bearing the eyes 

 at their rounded extremities. Antenna) of equal length, one-half 

 that of the body, with a few lung hairs ; flagella with ten much- 

 elongated articidi. Gnathopoda subequal, oblong. Posterior pair 

 of pleopoda with short rami, the outer ones uniform, the inner 

 minute, spine-like. Telson subcordiform, pointed l)ehind. 



" Length ^rds of an inch. 



" Uub. Tanegasiraa [Japan ?J." — 8thnpson. 



The posterior pair of pleopoda terminating in two rami, together 

 with the form of the teLson, incline me to believe that tliis species 

 belongs to the genus Ncenia ; but I hesitate to make the change, 

 since 1 only know the animal from the author's description. 



