24 EEV. T. E. E. STEBBING ON THE 



Second maxillm. The plumose setse occupying two thirds of the inner margin of the 

 inner plate. 



Maxillipeds, probably not to be distinguished from those of Urothoe marinus by any 

 constant character ; thus in one specimen one of the outer plates had six, and the other 

 seven, stout spines, while in another specimen each of these plates had eight stout 

 spines. 



First and second gnathopods not distinguishable from those of Urothoe marinus. In 

 a male specimen from North Wales there were eight spines in the distal spine-row of 

 the wrist, in a female from the same locality ten, and in another female from vSouth 

 Devon fourteen. 



First and second perwopods scarcely, if at all, distinguishable from those of Urothoe 

 marinus. In the specimens examined the fourth joint had six spines instead of five, 

 and the fiftli joint eight spines instead of seven, while the tubercles on the finger were 

 fewer and less pronounced. 



Third perwopods closely resembling those of Urothoe marinus, but the large first joint 

 with fewer indents on the hind margin, and its apex rather more acute; the third joLat 

 has nine or ten spines in each group of its distal margin ; the fourth joint ten or eleven 

 in each of its four groups ; the fifth joint also has larger groups of spines, and is rather 

 more widened, whereas the distal narrowing of the finger is much less abrupt than in 

 the species compared, and the marginal nodules are smaller. 



Fourth jierceojiods nearly resembling those of Urothoe marinus, but the third joint is 

 here rather longer than the fourth, having almost the whole of the hiud margin fringed 

 with the long plumose setae. 



Fifth perceopods closely resembling those of Urothoe marinus, but with the first joint 

 of the limb not wider above than below. In the female the first joint appears to have 

 the front margin more convex than in the male. 



Pleopods as in Urothoe marinus, but with no more than two cleft spines observed on 

 the ramus of any specimen. 



Uropods. Peduncle of the first pair much more elongate than in Urothoe marinus, 

 with two groups of setiform spines and five stouter spines on the outer and four spines 

 on the inner margin ; the rami slender, subequal in length to one another and to the 

 peduncle, nearly straight, reaching beyond the second pair, the outer having three 

 spines upon it, the inner having a little seta on its inner margin; the peduncle of the 

 second pair much shorter than that of the preceding pair, shorter than the rami, with 

 four spines on the outer and two on the inner margin ; the rami subequal, shorter than 

 the preceding pair, straight, the outer with two spines, the inner with a little seta ; the 

 peduncle of the third pair rather longer than broad, but otherwise this pair is scarcely, 

 if at all, to be distinguished from the corresponding pair in Urothoe marinus. 



'J.'elson diflfering very little from that of Urothoe marinus, the convex margins unbroken 



