287 Canon A. M. Norman and Dr. T. Scott on 



Outer ramus of the antenna? small and apparently triarticu- 

 late, but the middle articulation is minute and somewhat 

 indistinct. 



First pair of legs slender ; inner branches moderately 

 elongated ; first joint about as long as the entire outer 

 branch, while the second and third are about half the length 

 of the first, the middle joint being very small. The next 

 three pairs are also slender and elongated ; the inner branches 

 of the fourth pair, which are somewhat shorter than the outer, 

 are provided with a moderately long plumose seta near the 

 middle of the inner margin of each of the three joints, two 

 similar setse and a small spine spring from the apex of the 

 last joint. The fifth pair are of moderate size ; inner portion 

 of primary joint narrow, subtriangular, and provided with a 

 seta and two moderately stout spines on the inner margin 

 and two setse at the apex ; the secondary joint, which is 

 rather narrow, subcylindrical for about three fourths of its 

 length, then tapering obliquely to the pointed extremity, 

 extends considerably beyond the end of the primary branch , 

 and is furnished with two setse on the clistal half of the inner 

 margin, two on the outer margin, and one at the apex. 



Furcal joints very short. 



IJab. Dredged at Salcombe in 1875, and in Mill Bay, 

 Plymouth, among algae, in August 1903. 



This may be distinguished from other described species by 

 the structure of the slender first pair of natatory legs and the 

 peculiar form of the female fifth pair. 



Stenhelia varians, sp. n. 



In this species the female closely resembles Stenhelia 

 neylecta, just described, but differs in the following more or 

 less important particulars : — The first four joints of the eight- 

 jointed antennules are together nearly three times the entire 

 length of the last four ; the second joint is the longest and is 

 more than twice the length of the third, while the fourth is 

 about one and a half times longer than the same joint ; the 

 next three joints are very small and subequal, but the end 

 joint is about as long as the combined lengths of the two 

 preceding ones, as indicated by the formula — 



Proportional lengths of the joints . . 8 . 17 . 8 . 12 . 3 . 4 . 4 . 7 

 Numbers of the joints 1 2 3 4 5 6 7 8' 



The outer rami of the second antennas are triarticulate, 

 the middle joint being the smallest. The mouth-organs and 

 natatory legs are similar to those of S. neglecta. The fifth 



