372 



rk*. This new genus is chieHy characterised by the peculiar struc- 

 ture of the 1st pair <>!' leus. which dilfers conspicuously from that in any of the 

 other g.-nera 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 tlir u'cniis I)(irti/lt,],ti*in (D. brevicornis and latipes). Only a single species is 

 known to me. 



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



(Suppl. PI. U). 



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

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

 ( 'ephalic segment exceedingly large and having the posterior edge minutely denti- 

 culated : rostral projection large and prominent, lingniform in shape. Last pedi- 

 gerous segment abruptly much narrower than the proceeding ones. Urosome 

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

 t'audal rami short, quadrangular in form, apical setae normal and rather slender. 

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

 Dactylopusia firrrin/rnis, 3rd joint having a slight trace of a subdivision in the 

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

 with the hot 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 

 pi' "luced at the outer corner. Last pair of legs comparatively small, distal 

 joint of rounded form, and provided with 5 rather unequal marginal seta 1 ; 

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

 rying .") setae. 



I'olour not yet ascertained. 



Length of adult female 0.85 mm. 



/,''///"//>. As above stated, this form in several respects has a general 

 Pi -'inhlaiic.- to Dactylopusia /inr/n>nit* and its ally I), loti/ir*, and indeed I was at 

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

 -tincture of the 1 st pair of legs in the pre-ent species, howe\er. would seem to forbid 

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

 _ mi- Dactylopusia^ restricting the new genus to the present form. 



