:!sr> 



Occurrence. Only a solitary female specimen of this form has hitherto 

 come under my notice. It was taken in the Lyngen Fjord inside Farsund, from 

 a depth of about 50 fathoms, muddy sand. 



Amphiaseus lagenirostris, G. 0. Sars, n. sp. 



(Suppl. PI. 20). 



Specific Characters. Female. Body moderately slender and nearly cylin- 

 drical in form, being only very slightly tapered behind. Rostrum of a very peculiar 

 appearance, being considerably expanded at the base and narrowly exserted at 

 the tip, thus assuming a lageniform shape. Urosome much shorter than the 

 anterior division, last segment comparatively short. Caudal rami small, scarcely 

 longer than they are broad; apical setae normal and rather slender. Anterior 

 antenna; almost attaining the length of the cephalic segment, and 8-articulate, 

 2nd joint much the largest and narrower than the first, exhibiting in the middle 

 indside a well-marked setiferous ledge and produced at the tip to a sharp some- 

 what incurved dentiform projection, 4th joint about twice as long as 3rd, terminal 

 part slightly exceeding in length those joints combined. Posterior antenna? like- 

 wise rather slender, outer ramus distinctly 3-articulate, with the 1st joint longer 

 than the other 2 combined. Posterior maxillipeds with the hand comparatively 

 narrow and clothed inside with slender spinules. 1st pair of legs rather slender, 

 outer ramus much shorter than the 1st joint of the inner, middle joint with a 

 well-marked seta inside, last joint of about same size, and armed with 3 spines 

 and 2 geniculate setse, inner ramus with the 1st joint very narrow, linear, and 

 carrying near the end indside a well-developed seta, last joint about twice as 

 long as the middle one and armed in the usual manner, both joints combined 

 scarcely exceeding in length Va of the 1st. Natatory legs with the rami narrow 

 and the number of setse somewhat reduced, the last joint of the outer ramus 

 having in the 2 anterior pairs only a single seta inside. Last pair of legs with 

 the distal joint narrow oblong in form, marginal setse 6 in number, the 2 apical 

 ones much more slender than the others; inner expansion of proximal joint nar- 

 row triangular in form and extending about to the middle of the distal joint, 

 marginal setse 5 in number, 2 of them rather slender. 



Male much smaller than female, but exhibiting the very same characteristic 

 form of the rostrum. Anterior antennae hinged in the usual manner, their 2nd 

 joint agreeing in shape with that in female. Inner ramus of 2nd pair of legs 

 transformed in a similar manner to that in most other species of the present 

 genus. Last pair of legs with the distal joint much shorter than in female and 



51 Crustacea. 



