TA THE VOYAGE OF H.M.S. CHALLENGER. 



proposed liy Dana, must be retaineil. .md tlio family hereafter named Eucopiidaj, iu 

 liou of Chalaras]ii(l8e. 



The sfhizopodous nature of Eucopia is apparent both iu the powerfully developed 

 natatory branches (exopods) of all the legs, and more particularlj^ in the marsupial poueh 

 of the female, the latter exhibiting 25recisely the same structure as the same part in the 

 Lophogastridse. Indeed this last character alone would suffice to distinguish the species as 

 a true Schizopod, no other Podojjhtlialmians possessing, as stated above, a similar character- 

 istic. Moreover, the structure of the oral parts would seem to bear out this assumption, 

 for thev are. on the whole, rather similar to those in other true Schizopods. Thirdly, 

 the structure and arrangement of the gills exhibit a striking resemblance to those of the 

 corresponding parts in the Lophogastridfe. On the other hand, however, the very 

 peculiar and anomalous form of the legs would apparently prevent us from ranging 

 this Crustacean wdthin any of the three jireviously established families of Schizopoda, and 

 for this reason I have seen fit to adopt the view of the late Dr. v. Willemoes-Suhm in 

 regarding it as the type of a separate family. 



Genus Eucopia, Dana, 1852. 



Eiicopia, Dana, United States Exploring Expedition, Crustacea, part i. p. (iOO. 

 Chalarnspis, Sulim (ex parte). 



Generic Characters. — Integuments very thin and soft, membranous, t'arapace large, 

 <-overing whole of trunk, deeply emarginate posteriorly, lateral wings produced along the 

 .sides of tail ; frontal part rounded off, not rostrate. Caudal segments without distinct 

 epimera, smooth. Eyes imperfectlj^ developed. Antennular peduncle rather stout, inner 

 flagellum very small, outer strongly developed. Antennal scale large, jointed at apex. 

 Mandibular palp very slender. Maxill?e rather feeble iu structure ; first pair without 

 any palp, second pair with very small masticatory lobes, provided with only simple 

 l)ristles. Maxillipeds furnished with an imjaerfectly developed exopodite, the epipodite 

 exceedingly large. The three anterior pairs of legs short and strong, developed as 

 gnathopoda ; the three succeeding pairs exceedingly slender and elongate, mth propodal 

 joint slightly expanded and terminal claw very mobile : last pair filiform, outer part setose. 

 Branchife well developed, consisting of three bipiunate ramifications, the inner one 

 projecting beneatb the ventral face, the two others covered by the carapace. Pinnulse of 

 gills irregularly lobular. No branchiae at base of last pair of legs. Marsupial pouch 

 composed of seven pairs of incubatory lamellae. Telson rather large, tapering ; apex 

 entire, not incised. Outer plates of uropoda jointed at apex. 



Remarks.- — The genus does not. in my opinion, at present comprise more than a 

 .single species, described in detail below. Mr. Spence Bate having examined some of the 

 specimens from the Challenger Expedition, does indeed suggest that one of these is 



