391 



form excrescence unequally bilobed at the end, inner edge of the seta immediately 

 behind the excrescence coarsely ciliated. Eye wanting. Anterior antenna) somewhat 

 more slender than in the last species, but otherwise of a very similar structure, the 

 first 2 joints combined, however, not fully occupying half the length of the an- 

 tenna. Posterior antenna?, oral parts and the 4 anterior pairs of legs very little 

 different from those in A. confusus. Last pair of legs with the distal joint com- 

 paratively shorter and broader, oblong oval in form, setae of outer edge very 

 small, hair-like; inner expansion of proximal joint less produced, though extending 

 a little beyond the middle of the distal joint. Ovisacs comparatively small, 

 each containing a very limited number of ova. 



Colour whitish grey. 



Length of adult female 0.73 mm. 



Remarks. This form is perhaps still more closely allied to A. ff/i>hl(ij>x 

 than the preceding species, but is of smaller size than either of them, and more- 

 over at once recognised by the peculiar structure of the inner medial caudal 

 seta, which character seems to be pretty constant. Slight differences may also 

 be found in the structure of the anterior antennae and the last pair of legs. 



Occurrence. Some specimens of this form were found at Farsund and 

 Korshavn in depths ranging from 10 to 28 fathoms. In all of them the inner 

 medial caudal seta exhibited exactly the same peculiar excrescence inside the base. 



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



(Snppl. PI. 24, fig-. 2), 



Specific Characters, Female. Body somewhat more strongly built than 

 in the 2 preceding species, though nearly cylindrical in form. Rostrum rather 

 prominent and very acute at the tip. Urosome rather shorter than the anterior 

 division, and having the last segment well developed. Caudal rami about the 

 length of the anal segment, and of a comparatively broad, lamelliform shape, 

 with the inner edge conspicuously convex; apical setce of normal structure and 

 comparatively shorter than in the 2 preceding species. Eye absent. Anterior 

 antennae built in the same manner as in the said species, though somewhat shorter 

 and stouter. 1st pair of legs with the outer ramus fully as long as the first 2 joints 

 of the inner combined ; inner ramus with the outer 2 joints rather slender and combined 

 exceeding in length the 1st. Last pair of legs with the distal joint comparatively large, 

 oblong oval in form and having the setae of the outer edge well developed; inner 

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



Colour whitish. 



Length of adult female 0. 97 mm. 



