173 



Male with the 2nd basal joint of 1st pair of legs armed inside with a 

 second small spine in addition to that occurring in the female. Inner ramus of 

 2nd pair of legs only slightly transformed, biarticulate, distal joint lamellar, with 

 a small dentiform projection at about the middle of the outer edge, and beyond 

 it a comparatively small spine, tip armed with a slightly curved spine and a 

 slender seta outside the latter, inner edge with 3 ciliated setse. Last pair of legs 

 much smaller than in female, distal joint of insignificant size, and having only 4 

 partly spiniform setse; inner expansion of proximal joint very slight, with a slender 

 seta and a very small spinule at the tip. 



Colour not yet ascertained. 



Length of adult female 0.74 mm. 



Remarks. This new species is nearly related to A. similis Glaus, and 

 A. nasutus Boeck, and somewhat intermediate between these 2 species. It is 

 however easily distinguished from either of them by the much shorter and stouter 

 form of the body. In the structure of the anterior antennae it agrees with A. 

 similis, whereas that of the 1st pair of legs more resembles that in A. nasutus. 

 The last pair of legs are built upon the same type as in these 2 species, but are 

 of still larger size and pronouncedly foliaceous, whence the specific name here pro- 

 posed. In the male, the inner ramus of the 2nd pair of legs is very unlike that 

 in the 2 above-named species, and is far less conspicuously transformed. 



Occurrence. Some few specimens of this form were found in a sample 

 taken last summer at Risor, on the south coast of Norway. 



113. Amphiascus nanus, G. 0. Sars, n. sp. 



(PI. CXIV, fig. 1). 



Specific Characters. Female. Body comparatively short and stout, slightly 

 tapering behind, with the cephalic segment very large. Rostrum of moderate size 

 and usual form. Urosome much shorter than the anterior division. Caudal rami 

 very short, being about twice as broad as they are long, middle apical setse of 

 moderate length and slightly thickened at the base. Anterior antennae rather 

 elongated, 8-articulate, 4th joint somewhat longer than 3rd, terminal part consi- 

 derably exceeding half the length of the proximal one. Posterior antennae with 

 the outer ramus shorter than the terminal joint of the inner, middle joint very 

 small and without any seta. 1st pair of legs rather slender, outer ramus scarcely 

 exceeding half the length of the inner, middle joint without the seta on the 

 inner edge, last joint somewhat smaller and carrying on the tip 2 spines and 2 



23 Crustacea. 



