studies on marino Oslracods fi87 



this specu's (1!)06 a). The specimens investigated by me also varictl with i-egarcl to the strength 

 of their sculpture; in a juimber of them the sculpture was rather strong, in others, on the contrary, 

 it was more or less weak; I never, however, found it quite so weak as is stated by (J. 8. Bl'.ADY, 

 but it does not seem to me impossible that specimens which live at a very low temperature 

 might be more or less entirely destitude of sculpture (cf. C. borealis -maxima). The distinguishing 

 feature of the variation found by me was that it was continuous. Because of this it seemed to 

 me best not to retain the form laevis as a special variety, but in the list of synonyms given 

 above I have included it as a synonym of the type species. 



Habitat: — Antarctic Ocean: 



S. A. E., PI. station 64 b, lat. 48" 27' S., long. 42" 36' W.; depth, 2500—0 m.; 23. VI. 

 1902; temperature at the surface, 7,9" C. : 325 mature specimens and 20 juvenes; proportion 

 between males and females about 3 : 5; R. M. vS. 264 and 265. S. A. E., PI. station 65 b, at 

 the same locality; depth, 400—0 m.; 23. VI. 1902; temperature at 400 m., 3,95" C.: 2 mature 

 males and 9 mature females; R. M. S. 267. S. A. E., PL station 66 b, at the same locality; 

 depth, 200—0 m.; 23. VI. 1902; temperature at 200 m., 5,25" C: 8 mature males, 6 mature 

 females and 1 juvenis; R. M. S. 268. S. A. E., PL station 67 b, at the same locality; depth 

 100—0 m.; 23. VI. 1902; temperature at 100 m., 8,3" C: 14 mature males, 12 mature females 

 and 1 juvenis; R. M. S. 269. S A. E., PL station 68 b, at the same locality; depth 50 — m.; 

 23. M. 1902; temperature at 50 m., 7,55" C: 4 mature males and 1 mature female; R. M. S. 270. 

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

 7,9" C: 1 mature female; R. M. S. 291. S. A. E., PL station 347, lat. 49" 3' S., long. 46" 54' W.; 

 at the surface; 25. VI. 1902; temperature, 4,5" C. : 6 juvenes. S. A. E., PL station 70 b, lat. 

 49" 56' S., long. 49" 56' W.; depth 2700—0 m.; 27. \l. 1902; temperature at 2700 m. and at the 

 surface, + 1,67" C. and 3,4" C. resp. : 2 mature females; R. M. S, 272. At the same station; depth 

 '500 — m. : 1 mature female and 4 juvenes; R. M. S. 271. S. A. E., PL station 357, lat. 

 51"31'S., long. 54" 39' W.; at the surface; 1. VII. 1902; temperature, 5,0" C: 1 mature female 

 and 2 juvenes; R. M. S. 293. S. A. E., PL station 355, lat. 51" 34' S., long. 53" 18' W.; at the 

 surface; 30. VI. 1902; temperature, 4,5" C. : 3 mature females and 5 juvenes; R. M. S. 292. 

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

 at 500 m. and at the surface, 3,78" C. and 6,28" C. resp. : 6 mature males, 3 mature females and 

 2 juvenes; R. M. S. 279. S. A. E., PL station 301, at the same locality; depth 100— o ni.; 12. IW 

 1902; temperature at 100m., 5,78" C: 10 mature males, 12 mature females and 9 juv(>nes; R. 

 M. 8. 278. 8. A. E., PL station 300, at the same locaUty; depth 50—0 m.; 12. IV. 1902; tempera- 

 ture at 50 m., 6,21" C. : 6 mature males, 4 mature females and 2 juvenes; R. M. 8. 276 and 277. 

 8. A. E., PL station 298, at the same locality; at the surface; 12. IV. 1902: 1 mature male 

 and 14 mature females; R. M. S. 275. 8. A. E., PL station 60 b, lat. 52" 39' 8., long 37" 35' 

 W.; depth 500— m. ; 17. VI. 1902; temperature at 500 m. and at the surface, + 1,35" C. 

 and + 0,50" C. resp.: 1 mature female; R. M. S. 263. 8. A. E., PL station 307, lat. 52" 55' 8., 

 long. 53" 12' W. ; at the surface; 14. IV. 1902; temperature, 6,1" ('. : 1 mature male, 4 mature 

 females and 1 juvenis; R. M. 8. 280. 8. A. E., PI. stations .59 b and 318, lat. .53" 0' 8., long. 



