76 



the cephalic segment, and composed of 5 joints, the 2nd of which is the 

 largest and much longer than the 3rd; terminal joint oblong oval in form, 

 with some of the setae distinctly ciliated. Posterior antennae and oral parts of 

 the structure characteristic of the genus. Natatory legs rather poorly developed 

 and not very dissimilar in structure; inner ramus in all of them considerably 

 'shorter than the outer and biarticulate; outer ramus without any setae inside. 

 Last pair of legs with the distal joint long and narrow, sublinear in form, and 

 provided with 4 marginal setae, 2 on the outer edge, one at the tip, and one 

 on the inner edge, the latter very strong, spiniform; inner expansion of 

 proximal joint forming a well defined narrow plate edged with 3 strong setae 

 and extending about to the end of the first V;s of the distal joint. 



Male resembling the female in the general form of the body, but 

 easely recognisable by the strongly hinged anterior antennae. Inner ramus of 

 3rd pair of legs conspicuously transformed, being distinctly 3-articulate with 

 the middle joint armed at the end outside with a strong spine; terminal joint 

 small, with 2 slender setae on the tip. 



Colour not yet ascertained. 



Length of adult female 0.62 mm. 



Remarks. The present species is easily recognised by the very slender 

 and attenuated shape of the body, and more particularly by the structure of 

 the last pair of legs and that of the caudal rami. 



Occurrence. Some few specimens of this form were picked up from 

 samples taken at Riser and Korshavn in depths ranging from 30 to 60 fathoms 



Distribution. Scottish coast (Scott). 



62. Cletodes pusillus, G. O. Sars, n. sp. 



(Pi. Li). 



Specific Characters. Female. Body of a similar slender and narrow 

 shape to that in the preceding species, though somewhat less rapidly attenuated 

 behind. Cephalic segment scarcely attaining the length of the 3 succeeding 

 segments combined, and having the rostral projection less produced and blunted 

 at the end. Urosome almost the length of the anterior division and nearly 

 cylindrical in shape, with the last segment scarcely smaller than the preceding 

 one. Caudal rami long and narrow, nearly attaining half the length of the 

 remaining part of the tail; outer edg.e with a slight notch in front of the 

 middle carrying a small bristle; dorsal seta issuing a little beyond this notch; 

 apical seta about the length of the ramus. Anterior antennae comparatively 



