206 A HISTORY OF RECENT CRUSTACEA 
tices have been followed, in some stages of society, by 
human beings themselves. 
Phobérus, A. Milne-Edwards, 1881, has the eyes close 
together, small, and implanted on short rudimentary eye- 
stalks. The scale of the second antenne is large. The 
first pair of trunk-legs are long, slender, and cylindrical ; 
the second and third more slender and not quite so long; 
the fifth slightly subchelate. In Phoberus tenwimdnus, 
Spence Bate, from New Guinea, the entire surface of the 
animal is spinous. 
Nephropsis, Wood-Mason, 1873, has the eye-stalks 
small, the second antennz without a scale, the first pair of 
trunk-legs large, the second slender, the third slender and 
with the chelee minute, the last two pairs slender and 
simple. All the recorded specimens have been taken at 
great depths, from two or three hundred down to eight 
hundred fathoms. The type-species, Nephropsis Stewartz, 
Wood-Mason, from the Andamans, was supposed to be 
blind, but, according to Spence Bate, ‘it appears both 
from Wood-Mason’s own figures and from an examination 
of the Challenger specimens, that this genus cannot be 
described as being without organs of vision.’ Nephropsis 
atlantica, Norman, from the Firé Channel, has small and 
immature eyes. 
Eutrichochéles, Wood-Mason, 1876, was instituted to 
receive the Oancer modestus of Herbst from India, which, 
according to Wood-Mason, is ‘especially interesting as 
being the nearest known blood-relation of the remarkable 
blind crayfish,’ Nephropsis Stewurti. 
Family 3.—Potamotide. 
The carapace is sub-cylindrical, with a pronounced 
rostrum. The fourth and fifth pairs of trunk-legs are not 
chelate. The outer branch of the uropods has a transverse 
suture. The firsbp maxillipeds have an epipod devoid of 
branchial filaments; the second maxillipeds and the first 
three pairs of trunk-legs have the podobranchiz always 
provided with a plaited lamina. None of the branchial fila- 
