392 TAGE SKOGSBERG 



proximally and inwards; the other claws have at this part a chister of bristles, varying somewhat 

 in number. On the lamellae there are usually no long, stiff secondary bristles medially near 

 the four or five anterior claws; medially near the posterior claws, on the other hand, there are 

 often rather sparse bristles of this kind. At the anterior side of the first claw the lamellae often 

 have short, fine hairs; behind the claws too the lamellae have short, fine hairs. Apart from these 

 they are in most cases quite without hairs. 



The r o d - s h a p e d o r g a n (fig. 5, o = ?): In specimens with shells from 2,7 to 

 3 mm. long the rod-shaped organ was from 0,5 to 0,6 mm. long. In most cases it was 

 wealdy bent ventrally; it is quite without joints; somewhat j^roximally of the middle the 

 wall seems, however, somewhat weak (the organ is flexible here?); distally it is finely rounded; 

 it is smooth. 



Male: — 



Shell: — Length 2,4 — 3,2 mm. As in the case of the females, large individuals, with 

 shells from 2,9 to 3,2 mm. long, are found only in northerly locales, for instance at Greenland 

 and Spitzbergen, etc. The males seem, on the average, to be slightly longer (not shorter, as 

 other authors have stated, e. g. G. W. Muller, 1901, p. 10) than the females from the same 

 locale. Length : height, about 1,7:1; length : breadth about 2:1. Seen from the 

 side (fig. 1). it has its greatest height at about the middle. The ventral margin is somewhat 

 less arched than in the female; it has no pouting behind the incisur. The posterior projecting 

 corner of the shell is rather broadly rounded; above this corner the margin of the 

 shell is straight or weakly concave. The anterior and ventral corners of the rostrum, 

 especially the latter, are well-rounded ; the ventral corner has no spine-like process. The rostral 

 incisxir is almost rectangular; the small verruciform process, which in the female forms a boundary 

 between it and the ventral margin of the shell, is practically absent altogether. Seen from 

 beneath (fig. 2). it is of about the same type as the shell of the female, but somewhat 

 narrower. Surface of the shell: The sculpture is somewhat more weakly developed 

 than in the females. It has a few scattered bristles, some short and some long, just as 

 in the female; the long ones, situated especially on the posterior part of the shell, are 

 of the same type as the long ones in the female, but rather considerably longer. Seen 

 from within: With regard to medial bristles and selvage there is a fairly close resem- 

 blance between the two sexes. 



First antenna (fig. 8): — Most of the bristles on the second to the fifth joints 

 are somewhat shorter than the corresponding bristles in the female; with regard to the foui 

 posterior bristles on the fourth joint it is to be noted that the two middle ones are somewhat longer 

 than the medial and the lateral ones. In most cases there are no long secondary bristles on the 

 anterior bristle of tlie second joint, on the shorter of the two anterior bristles of the third joint 

 and on one to three of the four posterior bristles on the fourth joint. The sensory bristle of the 

 original fifth joint has four sensorial filaments distally, situated in the same way as the distal 

 sensorial filaments on the c-, f- and g-bristles of the female (cf. fig. 9). End joint: The a-bristle 

 is about as long as the fifth joint and has no long secondary bristles. The b-bristle is about as 

 long as the anterior sides of the third and fourth joints; it has two proximal and four distal 



