151 



corner more elongate, somewhat exceeding in length the corresponding ramus. 

 Anterior antennae comparatively shorter and stouter, 8-articulate, distal part ex- 

 ceeding half the length of the proximal one. Posterior antennae and oral parts 

 almost exactly as in the preceding species. 1st pair of legs likewise of a very 

 similar structure, though having the outer ramus a little longer in proportion to 

 the inner. Last pair of legs with the distal joint very large and expanded, of a 

 broadly rounded form, and carrying 7 marginal setae, the outermost one some- 

 what longer than the next, and occurring not far from the base ; inner expansion 

 of proximal joint extending somewhat beyond the middle of the distal joint, and 

 having the outermost seta longer than the 2 innermost ones. Ovisacs about as 

 in the preceding species. 



Male resembling that of A. cinctus in its external appearance, as also in 

 the structure of the anterior antennae and the inner ramus of 2nd pair of legs. 

 Spine attached to the inner corner of the 2nd basal joint in the 1st pair of legs 

 comparatively smaller than in the male of A. cinctus, and almost straight. Last 

 pair of legs with the distal joint comparatively shorter and broader, and the inner 

 expansion of proximal joint less prominent. 



Body all over, except on the dorsal face of the cephalic segment, of 

 a very dark chocholate-brown colour, changing to a deep indigo-blue on the caudal 

 rami and ventral appendages. 



Length of adult female about 1 mm. 



Remarks. This new species is closely allied to A. cinctus, Glaus, but is of 

 considerably larger size and more robust form of body, differing also slightly in 

 the structure of the anterior antennae and of the 1st and last pairs of legs. In 

 the living state it is moreover at once distinguished by the very different colour 

 of the body. 



Occurrence. I found this form last summer at Risor and Lillesand, on the 

 south coast of Norway, in moderate depths among algae. On account of the rela- 

 tively large size of the specimens and their very dark colour, it was a compara- 

 tively easy task to select them from the freshly-taken bottom-samples, even 

 without the aid of a magnifying lens. 



Specific Characters. Female. Body very slender and pronouncedly cylin- 

 dric in form, the anterior and posterior divisions being of almost uniform width 



95. Amphiascus similis (Glaus). 



(PI. XCIV). 

 Dactylopus similis, Claus. Die Copepoden-Fauna von Nizza, p. 25, PI. II, figs. 29, 30. 



