

386 



having only 5 rather unequal marginal setse ; inner expansion of proximal joint 

 with 2 apical setse accompanied outside by a small spinule. 



Colour not yet ascertained. 



Length of adult female 0.77 mm., of male 0.57 mm. 



Remarks. This is a very distinct and easily recognisable species, being 

 especially characterised by the peculiar form of the rostrum and the structure of 

 the anterior antennae. 



Occurrence. Only 2 specimens of this form, a female and a male, have 

 hitherto come under my notice. They were found in a sample taken last summer 

 at Korshavn, south coast of Norway, from a depth of 20 to 30 fathoms, coarse 

 sandy bottom. 



Amphiascus nanoides, G. 0. Sars, n. sp. 



(Suppl. PI. 21, fig. 1). 



Specific Characters. Female. Body comparatively slender, sublinear in 

 form. Rostrum narrow conical in shape. Urosome almost as long as the an- 

 terior division, last segment well developed. Caudal rami short, quadrangular; 

 middle apical setse rather strong and somewhat thickened in their proximal part, 

 exhibiting moreover a peculiar flexure, seta of outer corner unusually long. 

 Anterior antennae rather slender, 8-articulate, first 2 joints the largest, 4th joint 

 only slightly longer than 3rd, terminal part about the length of those joints 

 combined. Posterior antennse with the middle joint of the outer ramus very 

 small and without any seta. Posterior maxillipeds well developed, with the hand 

 oval fusiform in shape. 1st pair of legs with the outer ramus about the length of the 

 1st joint of the inner, middle joint without any seta inside, last joint a little 

 longer and armed with 2 spines only and 2 geniculate setse, distal spine coarsely 

 denticulated along the outer edge; inner ramus very slender, its last joint more 

 than 3 times as long as the middle one and armed in the usual manner, both 

 joints conbined nearly as long as the 1st. Natatory legs slender, with the 

 number of setse considerably reduced. Last pair of legs with the distal joint 

 narrow oblong in shape and carrying 5 marginal setse, the 2 apical ones very 

 slender; inner expansion of proximal joint triangularly produced and extending 

 considerably beyond the middle of the distal joint, marginal setse 5 in number. 



Colour not yet ascertained. 



Length of adult female 0.56 mm. 



Remarks. This form belongs to the smaller species of the genus, and 

 may easily be recognised by the thickened caudal setse and their peculiar flexure. 



