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



proposed l)y Dana, must be retained, and the family hereafter named Euc.opiidae, iu 

 lieu of Chalaraspidse. 



The schizopodous nature of Eucopia is apparent both in the powerfully developed 

 natatory branches (exopods) of all the legs, and more particularly in the marsupial pouch 

 of the female, the latter exhibiting precisely the same structure as the same part in the 

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

 a true Sehizopod, no other Podophthalmians possessing, as stated aboA^e, a similar character- 

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

 for they 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 jiarts in the Lophogastridse. On the other hand, however, the very 

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

 this Crustacean within 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. 



Eucopia, Dana, United States E.^ploring Expodition, Crustacea, part i. ]>. (lOi). 

 Ciialara^pis, Sulim {ex parte). 



Generic Characters. — Integuments very thin and soft, membranous. Carapace large, 

 covering whole of trunk, deeply emarginate postei-iorl}', lateral wings produced along the 

 sides of tail ; frontal jiart rounded off, not rostrate. Caudal segments wdthout distinct 

 epimera, smooth. Eyes imperfectly developed. Antennular peduncle rather stout, inner 

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

 Mandiljular palp very slender. MaxilbB rather feeble iu structure ; first pair without 

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

 In-istles. Maxillipeds furnished witli an imperfectly developed exopodite, the epipodite 

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

 gnathopoda ; the three succeeding pairs exceedingly .slender and elongate, with propt)dal 

 joint slightly expanded and terminal claw very mobile ; last pair fifiform, outer part setose. 

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

 projecting lieneath the ventral face, the two otliers covered hy the carapace. I'innulae of 

 gills irregularly lobular. No i)ranchi;t) at base of last jiair of legs. Marsupial pouch 

 composed of seven ])airs of inciiliatnry lanielte. Telson rather large, tapering; apex 

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



Remarks. — The genus does not, in mj^ opinion, at j)reseut comprise more than a 

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

 si>ecimens from the Challenger Ex]iedition, does indeed suggest that one of these is 



