384 



of them detected even the slightest trace of the spiniform lappet on the 2nd joint 

 of the anterior antenna? so characteristic of A. denticulatus, I think that it must 

 be kept apart from that species. 



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

 found in a sample taken last summer at Korshavn from moderate depth. It also 

 occurred occasionally in another locality, viz., at Agnefest, uppermost part of the 



Ros Fjord. 



Distribution. British Isles (Norman & Scott). 





Amphiascus amblyops, G. 0. Sars, n. sp. 



(Suppl. PI. 19, fig. 2). 



Specific Characters. Female. Body rather slender and only slightly atten- 

 uated behind, with very thin and pelluid integuments. Rostrum prominent, 

 conical ly produced. Urosome not nearly attaining the length of the anterior 

 division, last segment scarcely shorter than the preceding one. Caudal rami 

 short, broader than they are long; apical setae normal. Eye replaced by a diffuse 

 branching pigment of a light yellow colour. Anterior antennae moderately slender, 

 8-articulate, the first 2 joints much the largest and subequal in size, 4th joint a 

 little longer than 3rd, terminal part scarcely exceeding in length those joints 

 combined. Posterior antennae with the middle joint of the outer ramus well 

 defined and setiferous. 1st pair of legs with the outer ramus considerably shorte 

 than the 1st joint of the inner, middle joint without any seta inside, last joint 

 of about same size and armed with 3 spines and 2 geniculate setae; inner ramus 

 with the 1st joint narrow linear in form carrying near the end inside a slender 

 seta, last joint 3 times as long as the middle one and armed in the usual manner, 

 both joints combined scarcely more than half as long as the 1st. Natatory legs 

 with the rami very slender, but having the full number of setae. Last pair of 

 legs with the distal joint oval in form, tip slightly bilobular, marginal setae 

 comparatively shoit and 6 in number, the 2 apical ones very thin, hair-like; 

 inner expansion of proximal joint narrow triangular and extending somewhat 

 beyond the middle of the distal joint, marginal setae 5 in number. 



Colour whitish. 



Length of adult female 0.72 mm. 



Remarks. This form may, in the fresh state, at once be recognised by 

 its highly pellucid body and the imperfectly developed visual organ. In the 

 structural details also some well marked differences are found to exist, distinguish- 

 ing it from the other known species. 





