77 



more slender than in the preceding species, though scarcely as long as the 

 cephalic segment; 2nd joint of about same length as the 3rd, but somewhat 

 broader. Posterior antennae with the outer ramus very narrow and only 

 provided with a single seta issuing from the tip. Natatory legs comparatively 

 more slender than in C. Sarsi, with the setae of the inner ramus reduced in 

 number. Last pair of legs with the distal joint less slender, oblong fusiform 

 in outline, and carrying 5 marginal setae, 2 on the outer edge, 2 on the tip, 

 and one inside near the end, none of the setae spiniform ; inner expansion of 

 proximal joint very small, nodiform, with only 2 unequal setae; digitiform 

 process issuing from same joint outside exceedingly long and slender. 



Male exhibiting the usual sexual differences from the female, the 

 anterior antennas being conspicuously hinged, and the inner ramus of 3rd pair 

 of legs transformed in a similar manner to that in the preceding species. 



Colour not yet ascertained. 



Length of adult female 0.51 mm. 



Remarks. In the slender and narrow shape of the body this form 

 resembles somewhat C. Sarsi. It is however rather inferior in size and, on a 

 closer comparison, exhibits also several well-marked differences in the struc- 

 tural details, as indicated in the above diagnosis. 



Occurrence. Of this form also only a small number of specimens have 

 as yet come under my notice. They were found in samples taken at Riser 

 from a depth of about 60 fathoms. 



63. Cletodes leptostylis, G. O. Sars. 



(PI. LII). 

 ? Syn: Cletodes longicaudata, Brady (not Boeck). 



Specific Characters. Female. Body slender and attenuated, with the 

 segments sharply marked off from each other. Cephalic segment about the 

 length of the 3 succeeding segments combined; rostral projection of. moderate 

 size and terminating in 2 minute juxtaposed denticles. Urosome considerably 

 exceeding in length the anterior division, and rapidly tapered behind; genital 

 segment comparatively large and distinctly subdivided in the middle; last seg- 

 ment much smaller than the preceding one. Caudal rami exceedingly narrow 

 and elongated, occupying more than Vs of the entire length of the body; 

 outer edge with a well-marked notch near te base carrying 2 well-developed 

 bristles and with another smaller bristle close to the end; dorsal seta attached 

 considerably in front of the middle; apical seta shorter than the ramus, and, 



