157 



female, distal joint short and sub-cordate in form, inner expansion of proximal 

 joint slightly produced, and carrying 2 setae and a short spine outside the latter. 



Body in both sexes of a whitish colour, without any obvious pigmentary 

 ornament. 



Length of adult female 0.77 mm. 



Remarks. I cannot doubt that the above-described form is that origin- 

 ally recorded by Prof. Brady as StenheUa ima, though the figure he gives of the 

 last pair of legs in the female does not exactly agree with my own drawings. 

 It unquestionably belongs to the present genus, and may easily be recognized by 

 its exceedingly slender and narrow body, the very long rostrum, and the shape 

 of the last pair of legs in the female. 



Occurrence. I have met with this species occasionally both off the south 

 and west coasts of Norway in moderate depths among algae. The rostrum seems 

 to be more mobile in this species than in any of the others, being often found, 

 in preserved specimens, deflexed to such an extent, that it forms quite a right 

 angle with the axis of the body. 



Distribution. British Isles (Brady). 



99. Amphiascus Giesbrechti, G. 0. Sars, n. sp. 



(PL XCVIII). 

 Syn: StenheUa ima, Giesbrecht (not Brady). 



Specific Characters. Female. Body rather slender and somewhat attenu- 

 ated behind, with the anterior division considerably broader than the posterior. 

 Cephalic segment of moderate size; rostrum narrow triangular in form, and com- 

 paratively shorter than in A. imus. Epimeral plates rather small and rounded 

 behind. Urosome not nearly attaining the length of the anterior division, anal 

 segment somewhat shorter than the preceding one. Caudal rarai of moderate size 

 and quadrangular in form, being about as long as they are broad, and transversely 

 truncated at the tip; innermost but one of the apical setae peculiarly dilated at 

 the base, forming outside, immediately behind the articulation, a very conspicuous 

 bag-like swelling protruding over the base of the adjacent seta. Anterior antennae 

 moderately slender and gradually attenuated distally, 1st and 2nd joints the 

 largest and of about equal size, 4th joint longer than 3rd, terminal part con- 

 siderably exceeding half the length of the proximal part. Posterior antennae with 

 the outer ramus rather short, middle joint very small and without any seta. 1st 

 pair of legs with the outer ramus considerably longer than the 1st joint of the 



21 Crustacea. 



