268 



TAGE SKOGSBBRO 



Of the bristles on the end joint the two middle ones, which are developed like claws, seem to 

 be somewhat more powerfully armed than those of the species in question. 



Maxilla: — This shows close agreement with the maxilla in C. (V.) norvegica. The 

 first endite of the p r o t o p o d i t e has eleven, the second five and the third five masticatory 

 bristles. Distally-posteriorly the first endopodite joint has three bristles; the end joint 

 has thirteen bristles; a few of the a-bristles have, however, some few rather strong secondary 

 teeth at the middle. 



Fifth limb: — Only the left limb of one sexually mature female was investigated 

 — This showed a very close agreement with the corresponding appendage in C. (V.) norvegica, 

 the only differences that were observed being that the main tooth of the first e x o p o d i t e 

 joint was composed of eight, and not seven, constituent teeth, that the fourth exopodite joint 

 had only three bristles distally close to the inner edge and that the group of bristles situated 

 proximaUy of these bristles was represented by a single bristle. — It is to be noted that the 

 first endite of the p r o t o p o d i t e was defective, so that I cannot give any information 

 about its structure in this species. 



Sixth limb: — This is very similar to the corresponding appendage in C. ^ F.J 

 norvegica, but the specimen investigated had, however, only seven to ten bristles on the end joint. 



Seventh limb: — This is very similar to that of the preceding species. Cleaning 

 bristles: There were seven ventral and five or six dorsal bristles situated very close together 

 distally; proximally of these there were six or seven ventral and from six to nine dorsal bristles 

 scattered irregularly. The single chitinous peg on the dorsal wall of the cavity dorsally of the 

 end comb was finely serrated distally. 



F u r c a : — This is also very like that of the preceding species. It is to be noted that 

 in this species too, contrary to G. W. MCller's statement, the third claw is somewhat, though 

 only slightly, shortened and weakened. 



Upper lip, rod -shaped organ, lateral eyes: see G. W. MOller's 

 description. 



Material of 

 investigation. 



Relation to 

 C. (V.) norvegica. 



Parasites. 



Remarks: — As appears from the remarks on C. (V.) norvegica, p. 265, the above supple- 

 mentary description is based on a sexually mature female, which was kindly sent to me by 

 Prof. G. W. MUller. 



A comparison between the descriptions given above of this species and C. ( V.) norvegica 

 will show that we are dealing with two rather closely related species. Possibly they ought to 

 be denoted as representative forms in the Arctic and the Antarctic. 



It may be pointed out in passing that, although both forms possess a parasite of the 

 genus Cyproniscus, we are concerned, all the same, with two well-defined species of this genus, 

 one infecting the arctic, the other the antarctic, species. 



Distribution: — Antarctic: ,,Gausstation" of the G e r m a ji South Polar 

 E X p e d i t i o n, 1901 —1903. C^ommon, about 200 specimens were captured on several 

 occasions. {G. W. MUller, 1908.) 



