54 



Gen. Idyanthe, G. O. Sars. 



Remarks. This name was proposed by the present author in 1909, to 

 replace Idyopsis, the latter name having been preoccupied. 



43. Idyanthe dilatata, G. O. Sars. 



See Vol. V, p. 98, PI. LVII, fig. 1. 



(PI. XXXIII, fig. 3). 



Remarks. Of this form also only the female sex has been described. 

 The male, of which a solitary specimen was obtained at Riser, differs from the 

 female in a much similar manner to that found in Idyella. On the accom- 

 panying plate the inner ramus of a leg of the 2nd pair from this male specimen 

 is figured. 



Fam. Diosaccidae. 



Gen. Stenheliopsis, G. O. Sars. 



Remarks. Three well-defined species of this genus have been recorded 

 in Vol. V, and a 4th species, nearly allied to the typical one, is now added, 

 and will be described below. 



44. Stenheliopsis affinis, G. O. Sars, n. sp. 



(PI. XXXIV). 



Specific Characters. Female. General form of body resembling that 

 in 5. divaricata, being comparatively rather short and stout, with the anterior 

 division considerably broader than the posterior. Cephalic segment large and 

 evenly rounded in front; rostral plate prominent, linguiform, blunted at the tip. 

 Urosome about the length of the anterior division and quite smooth. Caudal 

 rami still more abruptly divergent than in the type species, but comparatively 

 less slender, scarcely exceeding in length the last 2 caudal segments combined, 

 each ramus armed at the somewhat thickened base with a transverse row of 

 small denticles; innermost but one of the apical setae very strong and closely 

 annulated in the middle, curving abruptly outwards and forwards in a sigmoid 



