150 



Male somewhat smaller than female, and having the urosome distinctly 

 5-articulate. Anterior antennae more strongly built, and transformed in the usual 

 manner. Spine attached to the inner corner of the 2nd basal joint in the 1st 

 pair of legs of extraordinary size and somewhat sigmoid in form. Inner ramus 

 of 2nd pair of legs nearly as long as the outer, distal joint carrying 2 closely 

 juxtaposed spiniform appendages outside, of which the proximal is very strong, tip 

 armed with another somewhat more slender appendage curving outwards. Last 

 pair of legs much smaller than in female, distal joint oval in form, inner expansion 

 of proximal joint with only 2 marginal setse. 



Body in both sexes of a whitish colour, with a broad transverse band of 

 a deep pink hue across the middle, occupying the whole of the first 3 free seg- 

 ments of metasome; dorsal face moreover exhibiting along the middle a narrow 

 longitudinal band of a light orange colour. 



Length of adult female 0.84 mm. 



Remarks. This form was originally described by Glaus from the Mediter- 

 ranean as a species of his genus Dactylopus, the specific name apparently refer- 

 ring to the peculiar colouring of the animal. It does not seem to have been observed 

 by subsequent authors; for the suggestion put forward by Prof. Brady, that it 

 might only be a variety of Dactylopus Stromi Cls. (= D. vulgaris G. 0. Sars), 

 is so extremely unreasonable, that it is impossible to believe that the true Clausian 

 species has been observed by that author. 



Occurrence. Some few specimens of this pretty form were found many 

 years ago ofi the west coast of Norway. Last summer, I found it again not 

 unfrequently in 2 different localities on the south coast, viz., Riser and Lillesand. 

 It occurs in moderate depths among algse, and in the living state is at once 

 recognizable, even with the naked eye, from any other species of this genus, by 

 the peculiar and beautiful colour of the body, which seems to be perfectly constant 

 in all specimens, both male and female. 



Distribution. Mediterranean off Nice (Glaus). 



94. Amphiascus obseurus, G. 0. Sars, n. sp. 



(PI. XCIII). 



Specific Characters. Female. Body of comparatively more robust form 

 than in the preceding species, otherwise of a very similar appearance. Urosome 

 with the segments coarsely spinulose along the ventral and lateral edges. Caudal 

 rami comparatively more massive than in A. cinctus, with the spine of the outer 



