372 



Remarks. This new genus is chiefly characterised by the peculiar struc- 

 ture of the 1st pair of legs, which dift'ers conspicuously from that in any of the 

 other genera belonging to the present family. In the other structural details, as 

 also in the external appearance, it exhibit a general ressemblance to some species 

 of the genus Dactylopusia (D. brevicornis and latipes). Only a single species is 

 known to me. 



Dactylopodopsis dilatata, G. 0. Sars. n. sp. 



(Suppl. PI. 12). 



Specific Characters. Female. Body short and stout, with the anterior 

 division considerably dilated and somewhat depressed, the posterior much narrower. 

 Cephalic segment exceedingly large and having the posterior edge minutely denti- 

 culated; rostral projection large and prominent, linguiform in shape. Last pedi- 

 gerous segment abruptly much narrower than the preceeding ones. Urosome 

 about half the length of the anterior division and very slightly tapered behind. 

 Caudal rami short, quadrangular in form, apical setae normal and rather slender. 

 Anterior antennse short and stout, 5-articulate, resembling in structure those in 

 Dactylopusia brevicornis^ 3rd joint having a slight trace of a subdivision in the 

 middle. 1st pair of legs much smaller than the 3 succeeding ones, outer ramus 

 with the last joint scarcely shorter than the middle one and rather narrow, oblong 

 in form, being armed outside with 3 simple spines successively increasing in 

 length distally and at the tip with 2 slender setse ; inner ramus scarcely as long 

 as the outer, proximal joint somewhat dilated and carrying inside below the middle 

 a plumose seta, distal joint small, incurved, with 2 unequal apical spines. Nata- 

 tory legs with both rami strongly built, middle joint of the inner one acutely 

 produced at the outer corner. Last pair of legs comparatively small, distal 

 joint of rounded form, and provided with 5 rather unequal marginal setse; 

 inner expansion of proximal joint extending beyond the distal one and car- 

 rying 5 setse. 



Colour not yet ascertained. 



Length of adult female 0.85 mm. 



Remarks. As above stated, this form in several respects has a general 

 resemblance to Dactylopusia brevicornis and its ally D. latipes, and indeed I was at 

 first inclined to combine these 3 species in a particular genus. The anomalous 

 structure of the 1st pair of legs in the present species, however, would seem to forbid 

 such a combination, and I prefer therefore to leave the 2 said species in the old 

 g^nus Dactylopusia, restricting the new genus to the present form. 



ucir- 



