28 



Length of adult female 0.75 mm. 



Remarks. The present species is allied to E. melaniceps Boeck, but of 

 considerably larger size and more slender form. The pronounced compres- 

 sion of the body is also very characteristic, and has indeed given rise to the 

 specific name here proposed. Finally, well-marked differences are found in 

 the structure of the anterior maxillipeds and of the last pair of legs. 



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

 were picked up from samples taken at Korshavn from a depth of about 60 

 fathoms, coarse muddy sand. 



19. Ectinosoma tenuipes, Scott. 



(PI. XVII, fig. 2). 



Ectinosoma tenuipes, Scott, Revision of the British species belonging to the genera Bradya and 



Ectinosoma. Trans. Linn. Soc. of London. Vol. VI, Part 5, p. 436, PI. 36, figs. 25, 32, 35; 



PI. 37, figs. 9, 19, 30, 47; PI. 38, figs. 12, 17, 36, 52. 



Specific Characters. Female. Body considerably shorter and stouter 

 than in the preceding species, with the anterior division somewhat dilated in 

 the middle. Cephalic segment about the length of the exposed part of the 

 trunk and gradually narrowed in front; rostral plate only slightly prominent 

 and, seen from above, obtusely blunted at the tip. Urosome about equalling 

 in length 2 /3 of the anterior division, and rapidly tapered behind; genital seg- 

 ment not fully as long as the 2 succeeding segments combined; anal segment 

 a little shorter than the preceding segment, and deeply incised behind in the 

 middle. Caudal rami short, quadrangular, and slightly divergent; apical setae 

 rather slender. Anterior antennae, as in the preceding species, 6-articulate, but 

 somewhat less slender. Anterior maxillipeds less powerful, and of the usual 

 appearance. Natatory legs with the rami comparatively slender and narrow, 

 some of the apical spines and setae excessively elongated. Last pair of legs 

 resembling in structure those in the preceding species, the distal joint exhibiting 

 a similar broadly rounded form, though distinguished by the presence of a 

 well-marked rounded prominence near the base inside, as also by the less 

 elongated marginal -setae, the outermost of which is much shorter than the 

 middle one; appendicular bristle, as in that species, attached to a narrow 

 digitiform process issuing from the edge between the 2 outermost setae; inner 

 expansion of proximal joint scarcely extending beyond the middle of the distal 

 joint, its outer apical seta about half the length of the inner and not spiniform. 



Colour of the living animal not yet ascertained. 



Length of adult female scarcely exceeding 0.60 mm. 



