narrow, inner expansion of proximal joint triangular and provided with only 2 

 spiniform setse at the tip. 



Body of a whitish colour, with a very faint yellowish grey tinge. 



Length of adult female 0.71 mm. 



Remarks. This new species is especially distinguished by its compara- 

 tively robust and pale-coloured body, as also by the apparent total absence of 

 eye. In the anatomical details it on the whole rather resembles the succeeding 

 species, though differing conspicuously in some few points. 



Occurrence. I found this form many years ago at Christiansund. west 

 coast of Norway, in a depth of 50 60 fathoms, muddy bottom. 



106. Amphiascus abyssi (Boeck). 



(PI. CVI). 



Dactylopus abyssi. Boeck, Nye Slsegter og Arter af Saltvandscopepoder. Chr. Vid. Selsk. Forh. 



1872, p. 56. 



Specific Characters. Female. Body rather robust and only slightly at- 

 tenuated behind, anterior division scarcely at all depressed. Cephalic segment 

 broadly rounded in front, rostrum of moderate size, terminating in an acute point. 

 Epimeral plates of the 3 succeeding segments acutely produced behind ; last seg- 

 ment narrower than the preceding one. Urosome much shorter than the anterior 

 division, and having the segments coarsely spinulose at the hind edge ventrally 

 and laterally, last segment shorter than the preceding one. Caudal rami resem- 

 bling in form those in A. pallidus, though armed both inside and outside with 

 small spinules, the 2 middle apical setaB distinctly spinulose and slightly thickened 

 at the base. Eye well developed, with the pigment of a very pale yellowish 

 hue. Anterior antennae remarkably short and stout, much curved and densely 

 clothed with setse, some of which are very strong and coarsely ciliated, 4th joint 

 scarcely longer than 3rd, and very obliquely truncated at the end, terminal part 

 about half the length of the proximal one, with the first 2 joints remarkably 

 short and broad. Posterior antennae with the outer ramus rather large, exceed- 

 ing in length the terminal joint of the inner, but otherwise of much the same 

 structure as in A. pallidus. 1st pair of legs somewhat less strongly built than 

 in that species, outer ramus scarcely longer than the 1st joint of the inner, and 

 densely spinulose outside, its middle joint shorter 'than both the 1st and last, 

 and provided inside with a rather large ciliated seta, last joint armed with 3 

 spines and 2 strong ciliated seta?, which are not geniculated; 1st joint of inner 

 ramus about the length of the other 2 combined, last joint very slender, linear 



22 Crustacea. 



