306 A HISTORY OF RECENT CRUSTACEA 
peduncles of the uropods very short, but the Mediterranean 
Nannastacus longirostris, Sars, has these peduncles tolerably 
long. Kossmann has instituted Nannastacus Sars from 
the Red Sea. 
Diops, 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. 
Cumella, Sars, 1865, has but one eye. Of the two 
species, pygmcea, Sars, and limicola, Sars, the former is 
found in British waters. | 
Spencebatea, 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, Spencebatea abyssicola, Norman, was taken in 
1,360 fathoms, in lat. 54° 53’ N., long. 10° 56’ W., west 
of Donegal Bay. 
Family 5.—Campylaspide. 
The carapace is strongly arched behind. The first 
antenne are alike in both sexes, with one of the flagella 
obsolete. The flagellum of the second antennz 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 maxille 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first maxillipeds is obsolete, the narrow epipod has the 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 swollen. The 
third maxillipeds closely resemble the first perzeopods. 
The first two pairs of pereeopods in the female and the 
first four in the male have well-developed swimming- 
branches. The pleopods are wanting in both sexes. The 
