168 



Remarks. This form was first detected by Canon A. M. Norman, and 

 was subsequently described and figured by Prof. Brady in his well-known Mono- 

 graph under the name originally proposed by Norman. It is a very distinct and 

 easily recognizable species, being especially distinguishable by the slender cylin- 

 drical form of the body, the highly chitinised integuments, and the unusual pro- 

 duction of the caudal rami. It is also of rather large size as compared with 

 the other species of this genus. 



Occurrence. I have found this form not unfrequently at Aalesund and 

 Christiansund, on the west coast of Norway, in moderate depths among algse. It 

 also occurs off the Finmark coast, several specimens having been taken many 

 years ago at Vadso. 



Distribution. British Isles (Brady). 



108. Amphiaseus affinis, G. 0. Sars, n. sp. 



(PJ. CIX). 



Specific Characters. Female. General form of body similar to that of 

 A. hispidus, being rather slender, subcylindrical. Rostrum of moderate size and 

 blunted at the tip. Caudal rami short, being considerably broader than they are 

 long, the 2 middle apical setae remarkably strong, dark-coloured and considerably 

 thickened at the base. Anterior and posterior antennae of much the same struc- 

 ture as in A. Mspidus. 1st pair of legs likewise of a very similar appearance, 

 though having the outer 2 joints of the inner ramus shorter and nearly equal 

 in size. Natatory legs exhibiting a reduction in the number of the setae similar 

 to that found in the above species. Last pair of legs with the inner expansion 

 of the proximal joint comparatively shorter than in A. hispidus, extending only 

 slightly beyond the middle of the distal joint, which latter exhibits a rounded 

 form very similar to that in the above-named species. Ovisacs somewhat more 

 divergent. 



Colour not yet ascertained. 



Length of adult female 0.82 mm. 



Remarks. This form closely resembles A. hispidus, both as regards general 

 appearance and structural details. It is however of rather inferior size, and is 

 moreover easily distinguished by the form of the rostrum and the much shorter 

 caudal rami. 



Occurrence. Some few specimens of this form, all of the female sex. 

 were collected from samples taken during the summer of 1905 at Risor and Lille- 

 sand, on the south coast of Norway. 



