BY GEO. M. THOMSON, F.L.S. 67 



Pereiopoda, increasing in length posteriorly. Second pair 

 with coxal plates broadened and rounded behind ; third pair 

 ■with coxal plate short, two-Iobed, front lobe rounded, hind lobe 

 produced somewhat downwards, and bearing three spiues; 

 fourth and fifth pairs with the coxal plate developed only as a 

 posterior lobe ; basal plates extended widely. 



Pleopoda, with the peduncles smooth, their extremity pro- 

 duced — in some pairs at least — into a curved process beside 

 the base of the outer ramus. 



Uropoda (PI. iii , fig. 2) — First pair with a long peduncle 

 and short rami ; second pair with peduncle not reaching to 

 extremity of that of the preceding pair, rami sub-equal ; both 

 pairs furnished with a row of marginal spines on the peduncle, 

 and three or four on the rami ; Peduncles of the third pair 

 much shorter than the telson ; rami, sub-equal in length, 

 broadly lanceolate in form and tapering to a very acute apex, 

 fringed on both margins with numerous spines, each carrying 

 a long plumose seta in its axil. 



Telson, long, reaching as far as the extremity of the second 

 pair of uropoda, cleft beyond the centre, the lobes slightly 

 tapering and rounded at the ends, margins quite destitute of 

 spines or setse. 



Length of the largest specimen, 7 mm. (about ^^th of an 

 inch). 



This species was found in rock-pools at Pirates Bay. 



This species may belong to Boeck's genus, Pontogeneia, but 

 differs in having the third joint of the mandible-palp nearly 

 as long as the second, and in wanting the accessory one-jointed 

 appendage to the first antennae. 



On the other hand, Stebbing defines Atyloides as having 

 "spine-teeth (not slender spines) on the inner margin of the 

 outer plate of the maxillipeds." In the present species the 

 inner margin has slender spines and no teeth. The distinctions 

 between the two genera seem to me altogether too slight. 



Pam, Gammarlr^CB. 

 Genus Niphargus, Schiddte. 



This genus was instituted in 1851, for the reception of an 

 eyeless Amphipod, found in the subterranean waters of various 

 parts of Europe. Spence Bate, in the British Museum Cata- 

 logue, gives us one of the characters of the genus '• eyes 

 minute," and describes four species, all subterranean. Czer- 

 niavski, in 1868, added a species from the Black Sea, with 

 ** oval, fairly large eyes," while Grimm obtained another, a 

 blind species, in the Caspian, at depths of 35-90 fathoms. 



Among the Crustacea examined by me in the present 

 collection are two fresh-water species, which I think must be 



