698 

 Page 479. Tritaeta gibbosa (male;. 



(Suppl. PI. VIII, %. 1). 



On the original plate, only the female of this form was figured, and 

 in the text the male was only briefly mentioned as exhibiting the usual sexual 

 differences. Mr. Walker has, however, recently called my attention to some 

 very curious peculiarities in the male of this form, which had hitherto escaped 

 my attention, and in order to show these,, I give on the accompanying plate 

 a habitus-figure and some anatomical details of that sex. As will be seen 

 from the figure, the body is, as usual, much more slender than in the female, 

 and also more compressed, and moreover, the segments of the metasome, especi- 

 ally the last one, have the posterior edge somewhat raised dorsally. The 

 eyes are comparatively larger and more oval in form, extending somewhat 

 higher up on the sides of the cephalon. Both pairs of antennae, but especially 

 the inferior ones, are comparatively more slender and elongated, and on the 

 peduncular joints of the latter a dense clothing of fine hairs is observable. 

 The most striking feature is however the peculiar modification of the anterior 

 gnathopoda in this sex, the propodos constantly having, on the upper side, 

 a very conspicuous, deep sinus, of which no trace is found in the female. 

 According to Mr. Walker, this peculiar sexual character has given rise to the 

 establishment of a spurious species, viz., T. doliclionyx (Nebeski), which is 

 nothing but the male of T. gibbosa. It may be added that the branchial 

 lamellae, unlike what is the case in the female, are distinctly lobular, as in 

 certain species of the genus Paratylus, and that the last pair of uropoda have 

 the rami comparatively larger. 



Page 503. Gammarus pulex. 



Distribution. - France (Bonnier). 



Page 515. Eriopisa elongata. 



Distribution. British Isles (Robertson). 



Page 569. Photis Reinhardi. 



Distribution. British Isles (Herdman). 



Page 576. Podoceropsis excavata. 



Coast of France (Chevreux). 



