87 



the 2 preceding species. Natatory legs with the inner ramus still more reduced 

 in size and apparently quite wanting on the 4th pair; outer ramus in this and 

 the 2 preceding pairs very slender and narrow. Last pair of legs with the 

 distal joint narrow linear in form and imperfectly defined at the base, marginal 

 setae rather small and 4 in number; inner expansion of proximal joint very 

 slightly produced and carrying 2 unequal setae. 



Colour whitish grey. 



Length of adult female 0.53 mm. 



Remarks. This small species may be easily recognised by the some- 

 what unusual shape of the body, the anterior division being, unlike what is 

 generally the case, conspicuously broader than the posterior. In the structural 

 details it shows itself however to be a true member of the present genus. 



Occurrence. Some few specimens of this form, all of the female sex, 

 were found at Ris0r in depths ranging from 30 to 50 fathoms, muddy bottom. 



Gen. Leptocletodes, G. O. Sars, n. 



Generic Characters. Body of slender form, with very thin and fragile 

 integuments. Rostral projection inconspicuous. Urosome narrower than the 

 anterior division, with the segments scarcely denticulate behind; last segment 

 comparatively large. Caudal rami narrow and rather far apart. Anterior 

 antennae 7-articulate, with the terminal joint elongate. Posterior antennae small 

 with the outer ramus imperfectly developed. Mandibular palp distinctly biarticu- 

 late. Maxillae with a small exopodal lobe tipped with a single bristle. Max- 

 illipeds normal. Natatory legs slender, with both rami well developed, the 

 inner one shorter than the outer and biarticulate. Last pair of legs with the 

 proximal joint scarcely expanded inside; distal joint long and slender. 



Male unknown. 



Remarks. This new genus is only founded on a single species, which 

 however cannot properly be referred to any of the hitherto known genera of 

 the present family, though in some respects apparently approaching somewhat 

 the genus Eurycletodes. The generic name here proposed alludes both to the 

 comparatively slender form of the body and to the very thin and fragile 

 integuments. 



