418 EEY. T. E. K. STEBBING ON AMPHIPODA FROM 



First and second gnathopods and frst and second pertpopods. All these are scarcely 

 distinguishable from the corresponding limbs in Iphiplateia Whiteleggei. In common 

 with the three following pairs of perteopods they have on the inner margin of the sixth 

 joint not only a tolerably strong apical spine, but a similar one nearer the middle. 



Third j)er(eopods. The second joint is broader than long, with very convex hind 

 margin ; the fourth joint is not longer than the third, and is very broad by reason of the 

 great hind lobe ; the fifth joint is neither so long nor so broad as the third ; the sixth and 

 the finger are as in the kindred species in general, but the inner setule of the finger 

 not very strong. 



Fourth perceopods. These are like the third, except that the lobe of the fourth joint 

 is less expanded, and the second joint is smaller. 



Fifth perceopods. These are like the fourth, except in regard to the second joint, 

 which is not only much smaller, but differently shaped, the hinder exjiansion not quite 

 reaching, instead of overlapping, the third joint 



First pleop)ods. Peduncle about twice as long as broad, with two coupling-spines ; the 

 rami slender, with elongate first joint and six or seven short ones. 



Second pleopods. Peduncle broader than long, with two coupling-spines on the convex 

 but not otherwise projecting inner margin, the rami broader than in the first j)air. 



Third pleopods. Peduncle short, with the coupling-spines on a sliort but very 

 distinctly produced process ; the rami broad, subequal, differing little from those of the 

 second pair. 



First uropods. The peduncle is slightly longer than the longer (probably the outer) 

 ramus, the other ramus shorter and somewhat curved ; both are narrow, each with a 

 spinule and short stout spine on the apex. 



Second uropods. The peduncle docs not reach the end of the telson ; it has the apex 

 armed with a spinule and short, stout spine; the narrowly oval, single ramus similarly 

 armed. 



Third uropods. Attached to the ventral plate, which represents the sixth pleon- 

 segment, are two membranous, rather conical, plates, which together occupy the breadth 

 of the telson, but do not reach its apex. 



Telson. Triangular, with rounded apex. 



Length. Less than 5 mm. 



Hah. Watson's Bay, Australia. A single specimen, a female with eggs, occurred in 

 the gathering from low-tide line, obligingly sent me by Mr. Thomas Whitelegge. 



The species is remarkably like Pereionotus testudo, as figured by Delia Valle, to whom 

 I am indebted for a specimen from the Mediterranean. It differs by the absence of the 

 lateral tubercles on the perseon-segments, the want of any conspicuous setules on the 

 distal margin of the first four pairs of side-plates, the presence of a submedian spine on 

 the inner margin of the sixth joint of the limbs, and in having the peduncle of the 

 second pleopods not outdrawn. The third uropods are obscure in both species, but 

 api)arently present and similar in both. 



