Rev, T. R. R. Stebbing on the Genus Bathyporeia. 77 



sile-eyed Crustacea ' might very well represent the coalescing 

 of long hairs or setse. 



The tourtli 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 tlie want of a sinus has been attributed to B. pelagica as 

 a specific difterence. The form with the long antennaj cer- 

 tainly possesses the sinus in question in a manner })erfectly 

 well marked. The elevated part of the segment behind the 

 sinus is surmounted by two short setai 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 ])art 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 

 wlien 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 antennas 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 Sitlcator 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 antennae 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 



