648 TAGE SKOGSBERG 



Seen from below both the males and the female shells difier from those of the type species by 

 having the posterior part somewhat less developed; in most cases this was not, even in the 

 females, perceptibly larger than the anterior part. 

 Other organ.<. With regard to the mandible, maxilla, fifth, sixth and seventh Umbs, furca, upper Up 



and paragnates the Scandinavian and the Antarctic forms of this species agree with each other. 

 The e-bristle on the female first antenna has proximally on the anterior side similar hairs to 

 those of the type species. 



Habitat: — Antarctic Ocean: 



S. A. E., PL station 64 b, lat. 48" 27' S., long. 42" 36' W'.; depth 2500 m.— m.; 23. ^^. 

 1902; temperature at the surface 7,90° C. : 26 mature males, 65 mature females and 5 juvenes; 

 R. M. S. 223 and 224. S. A. E., PL station 65 b, at the same locahty; depth 400—0 m.; 

 23. VI. 1902; temperature at 400 m. -j- 3,95" C: 2 mature males, 4 mature females and 1 juvenis; 

 R. M. S. 225. S. A. E., PL station 66 b, at the same locality; depth 200—0 m.; 23. VI. 1902; 

 temperatiire at 200 m., 5,25" C. : 1 mature female and 2 juvenes; R. M. S. 226. S. A. E., 

 PL station 345, lat. 48" 32' S., long 44" 28' ^\'.; at the surface; 24. VI. 1902; temperature 

 7,9" C: 1 juvenis; R. M. S. 233. S. A. E., PL station 347, lat. 49" 3' S., long. 46" 54' W.; 

 at the surface; 25. XL 19U2; temperature, 4,5" C: 2 juvenes; R. M. 8. 234. S. A. E., PL 

 station 70 b, lat. 49" 56' S., long. 49^^ 56' W.; depth, 2700—0 m.; 27. VI. 1902; temperature at 

 2700 UL and at the surface, -j- 1,67" C. and 3,40" C. resp.: 5 mature females and 1 juvenis; 

 R. M. S. 228. At the same station; depth 500 — m.: 2 matiue females; R. M. S. 227. S. A. 

 E., PL station 302, lat. 52" 6' S., long. 55" 32' W.; depth, 500—0 m.; 12. IV. 1902; temperature 

 at 500 m. and at the surface, 3,78" C. and 6,28" C. resp.: 2 mature males; R. M. S. 229. S. A. 

 E., PL station 316, lat. 53" 0' S., long. 48" 27' W.; depth, 100—0 m,; 17. IV. 1902; temperature 

 at 100 m. and at the surface, 3,0" C. and 3,40" C. resp.: 1 mature female; R. M. S. 231. 

 S. A. E., PL station 317, at the same locahty; depth 250 — m. ; 17. IV. 1902; temperature 

 at 250 m., — 1,30" C: 1 mature female; R. M. S. 232. S. A. E., PL station 312, lat. 53" 1' S., 

 long. 51" 53' \V.; depth 200 — m.; 15. IV. 1902; temperature at 200 m. and at the surface, 

 3,50" C. and 5,48" C. : 1 mature male, 3 mature females and 2 juvenes; R. ^L S. 230. 



IHstribution: — The Antarctic Ocean between lat. 26" S. and lat. 43" S. All the localities 

 referred to above are thus south of the previoxLsly known area of distribution. 



Rotundata group G. W. MCller. 



This group comprises five species (one of which is divided into two sub-species) besides 

 the two dealt with below. As has already been pointed out by G. W. MCLLER, it can be distinctly 

 defined from other groups belonging to this genas. It is characterized especially by the position 



