303 A HISTORY OF RECENT CRUSTACEA 



peduncles of the uropods very short, but the Mediterranean 

 Nannastacus longirosiris, Sars, has these peduncles tolerably 

 long. Kossmann has instituted Nannastacus Sarsii from 

 the Red Sea. 



Bio'ps^ Paulson, 1875, as its name implies, has two 

 separate eyes, and may be the same as Nannastacus^ but 

 the species parvulus and spinosus are represented with the 

 carapace much narrowed in front, and it is difficult to 

 make them agree with any recognised species of Nan- 

 nastacus. 



Gumella^ Sars, 1865, has but one eye. Of the two 

 species, pygmcea, Sars, and limicola, Sars, the former is 

 found in British waters. 



Spencehatea, Norman, 1879, has the uropods greatly 

 developed, with the peduncle much longer than the 

 branches, although the inner of these consists of a long 

 joint and a greatly developed terminal spine. Canon 

 Norman informs me by letter that it has an eye. The 

 single specimen, measuring a sixth of an inch, of the single 

 species, Spencehatea ahyssicola^ Norman, was taken in 

 1,360 fathoms, in lat. 54° 53' N., long. 10° 56' W., west 

 of Donegal Bay. 



Family 5 . — Campylaspidce . 



The carapace is strongly arched behind. The first 

 antennae are alike in both sexes, with one of the flagella 

 obsolete. The flagellum of the second antennae is com- 

 posed of long and slender joints. The mandibles have 

 the anterior branch obliquely truncate and toothed, the 

 molar process narrow, stiliform. The first raaxillse are 

 very large, the second feeble. The terminal part of the 

 first maxillipeds is obsolete, the narrow epipod has the 

 branchial sacs arranged in a semicircle. The second 

 maxillipeds have the penultimate joint stvollen. The 

 third maxillipeds closely resemble the first perseopods. 

 The first two pairs of perseopods in the female and the 

 first four in the male have well-developed swimming- 

 branches. The pleopods are wanting in both sexes. The 



