26 



the other 2, issuing close to the base of the joint; appendicular bristle attached 

 immediately inside this lobe; inner expansion of proximal joint extending beyond 

 the middle of the distal joint; marginal setae of these legs rather unequal, none 

 of them however of any considerable length. 



Colour of the living animal not yet ascertained. 



Length of adult female amounting to 0.82 mm. 



Remarks. The present species exhibits some points of affinity both to 

 E. angulifrons G. O. Sars and to E. Herdmani Scott, differing however from 

 both in the still more slender form of the body and in the powerfully developed 

 anterior maxillipeds. From E. Herdmani, which it resembles in the thin and 

 pellucid integuments, it is moreover distinguished by the different form of the 

 anterior lip and by the less strong and rather unequal marginal setae of the 

 last pair of legs. 



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

 picked up from a bottom-sample taken at Korshavn from a depth of about 60 

 fathoms, coarse muddy sand. 



17. Ectinosoma clavatum, G. O. Sars, n. sp. 



(PI. XVI, fig. 2). 



Specific Characters. Female. Body comparatively robust, subclavate 

 in form, being conspicuously dilated in its anterior part and rapidly tapering 

 behind. Rostral plate not much prominent and obtusely blunted at the end. 

 Urosome considerably exceeding in length the exposed part of the trunk; 

 genital segment not attaining the length of the 2 succeeding segments com- 

 bined; anal segment scarcely half the size of the preceding segment, and slightly 

 incised behind in the middle. Caudal rami somewhat produced, being con- 

 siderably longer than thy are broad at the base, and only slightly divergent, 

 each ramus exhibiting dorsally a well-marked longitudinal keel; apical setae 

 somewhat thickened in their proximal part and rather elongated. Anterior 

 antennae comparatively short, though, as in the preceding species, composed 

 of 6 well-defined joints. Anterior maxillipeds far less robust than in the pre- 

 ceding species, exhibiting the structure usually met with in the species of the 

 present genus. Last pair of legs comparatively large, with the distal joint 

 oblong quadrangular in form and rather regularly trilobate at the end, middle 

 lobe the most prominent; inner expansion of proximal joint extending al- 

 most as far as the distal joint; marginal setae of these legs of rather unequal 

 length, that issuing from the middle lobe of the distal joint being the longest 



