176 



longer, oblong oval in form, carrying 4 spines, and inside them a slender seta; 

 inner ramus with the last joint very slender and narrow, being more than 3 times 

 as long as the preceding joint, the two combined a little shorter than the 1st. 

 Natatory legs with the rami rather narrow, the inner one in the 2 anterior pairs 

 slightly exceeding in length the outer, in 4th pair considerably shorter, number 

 of setae less reduced than in the 2 preceding species. Last pair of legs of mod- 

 erate size and highly chitinized, distal joint narrow oblong in form, terminating 

 in a hook-like, outwards-curving projection, inside which 2 small hair-like bristles 

 are attached, outer edge irregularly indented and provided with only a single 

 seta, inner edge with 2 setse near the end, the distal one very slender and elong- 

 ated; inner expansion of proximal joint narrow linguiform, extending beyond the 

 middle of the distal joint, and carrying 5 marginal setse, the 2 apical ones rather 

 small and somewhat unequal, the 2 innermost spiniform. Ovisacs comparatively 

 small, and containing a very limited number of ova. 



Male somewhat smaller than female and exhibiting the usual sexual dif- 

 ferences. 2nd basal joint of 1st pair of legs with 2 obtuse projections inside in 

 addition to the spine. Inner ramus of 2nd pair of legs transformed in the usual 

 manner. Last pair of legs smaller than in female, but with the distal joint of a 

 very similar shape, inner expansion of proximal joint less developed, and provided 

 with only 2 unequal spines bifid at the tip. 



Colour whitish. 



Length of adult female 1.14 mm. 



Remarks. This is a very distinct and easily recognizable species. In the 

 total absence of eye, and the unusually produced caudal rami, it somewhat recalls 

 the above-described A. typhlops. It is however of still more slender form of body, 

 and moreover differs in the much more elongated anterior antennae, as also in the 

 peculiar structure of the last pair of legs in both sexes. 



Occurrence. Several specimens of this remarkable form were taken last 

 summer at Farsund, south coast of Norway, from a depth of from 30 50 fathoms, 

 muddy sand. 



116. Amphiascus tenellus, G. 0. Sars, n. sp. 



(PI. CXVI). 



Specific Characters. Female. Body rather slender, though not to such a 

 degree as in the preceding species, being slightly attenuated behind. Integuments 

 very thin and pellucid, Rostrum narrow, lanceolate. Urosome shorter than the 



