Rey. T. R. R. Stebbing on the Genus Bathyporeia. 77 
sile-eyed Crustacea’ might very well represent the coalescing 
of long hairs or setee. 
The fourth segment of the tail has a deep transverse sinus, 
generally very conspicuous, but sometimes, especially after the 
animal is dead, concealed by the hinder portion of the prece- 
ding segment. It is no doubt from this casual concealment 
that the want of a sinus has been attributed to B. pelagica as 
a specific difference. ‘The form with the long antenne cer- 
tainly possesses the sinus in question in a manner perfectly 
well marked. The elevated part of the segment behind the 
sinus is surmounted by two short setee and also by two short 
spines. The hairs stand upright; the spines generally point 
backwards. The segment is deeply excavated below as well 
as above. 
There is a peculiarity worth noticing in the coxa of the 
first pair of legs. It does not lie parallel to those which follow 
it, but has a sort of neck at its upper part attached to the 
hinder part of the segment to which it belongs, the whole of 
this neck-like portion being completely covered by the coxa 
of the succeeding segment. 
The skin of the animal is white and semitransparent. Some 
specimens have the tail part prettily blotched with pink. 
Under a high power, portions of the skin exhibit markings 
resembling those common on fish-scales. 
Other species of this beautiful little genus will be welcome 
when they are forthcoming; but it has probably been made 
clear by the foregoing details that a single species of it must 
content us for the present. That the male should have more 
fully developed antennz than the female is perhaps rather the 
rule than the exception among the Amphipoda. It is a little 
singular that in the same hunting-ground the full-grown male 
should have been much more rare than the other two forms, 
of the female and the young; but another afternoon’s research 
might have altered the proportion of numbers altogether, while 
it would be extremely peculiar, not to say improbable, that 
the same stretch of sand should have yielded three different 
species of one genus, though yielding no other Amphipod, 
except the very different form of Su/cator arenarius. 
Since writing the above account I have had the opportunity of 
searching the sands on the south coast, which stretch for about 
fourteen miles from Lancing by Worthing and Goring, and on 
past Littlehampton. In this district also I have taken all the 
three forms, but those with the long antenne very sparingly— 
the latter circumstance suggesting the conjecture that the adult 
males are less littoral in their habits than the females. My 
search, in company with a friend, was continued almost every 
