48 
Figures 
Figures 
Figure 
Figures 
Figure 
Figure 
Figure 
Figure 
Plate IV 
C. canadensis var. anticosiicnsis fonua arctlca Troedsson and 
Sarcinuhi organ urn (Linn.) 
la and b. C. canadensis var. anticosiicnsis forma arctica. Thin sections of a 
colony from cape Hilgard, Ellesniei e island. This specimen is the “ tiar- 
cintda orj 7 aHHm’' of Etheridge 1878. B.M. K4920, x 1'13. 
2a and b. C. canadensis var, anticostiensis forma arctica. Thin sections of 
portion of hole type of "C. arctica" Troetlsson. Cape Calhoun, Xorthwest 
Greenland. M.M.K. 3027. Drawn on a oiiinera lueida, x 1-13. 
3. C. canadensis var. anticostiensis forma arctica. Thin section of a specimen 
from cape Calhoun, Northwest Greenland (metatype of “C. arctica" 
Troedsson). M.M.K. 43C. Drawn on a camera lueida, x 1-13. 
4a and b. l^arcinnta organum (Linn.). Sections of a speciinen from Yainlingbo, 
Gotland. B.M. R25852, x M3. 
5. jS, organum (Linn.). Section of a specimen fi’om Group 5a, Herb, Norway. 
B.iSI. R30513, X M3. 
6. R. organum (Linn.). Section of a specimen from Group 4, Oscarskal, Hero, 
Norway. B.M. R31514, x 1*13. 
7. S. organum (Linn.), Longitudinal thin section of a specimen from the 
Caradocian of High Haume. England. S.M. AGaoTb, x M3. 
8. S. organum (Linn.). Section of a specimen from Group 4, Gslo, Norway. 
B.M. 56147. X M3. 
