44 
Plate II 
Calapocria canadensis Bill, and Lyopora favosa (M’Coy) 
Figures la and b. O, canadensis Bill. Sections of an abnormal specimen from the 
Cape Calhoun beds, Northwest Greenland. (See page 9) M.M.K. 431. 
Drawn on a camera lucida, x 1-13. 
Figures 2a and b. C. canadensis Bill. Sections of a specimen from Akpatok island, 
N.'W.T. a, S.M. ACGSSc, b, S.M. AG&89'b. Drawn on a camera lucida, 
X M3. 
Figures 3a and b. Lyopora favosa (MToy). Thin sections of a specimen from the 
Craighead limestone. S.M. A6382, x 1*13. 
Figures 4a and b. L. favosa (M’Coy). Thin sections of the syntj’pe figured on Plate 
I, figures la, b. SJVI. A5526b and c, x 1*13. 
Figiire 5a and b. C. canadensis Bill, ’I'liin section of a specimen from the Cape Cal- 
houn beds. Northwest Greenland. M.M.K. 433. Drawn on a camera 
lucida, X 1'13. 
Figures 6a and b. C. canadensis Bill. Thin section of a specimen from the Cape Cal- 
houn beds. Northwest Greenland. M.M.K. 428. Drawn on a camera 
lucida, X 1-13. 
Figure 7. C. canadensis Bill, Longitudinal thin section of a specimen from Warren 
county, Ohio, to show “diisruptive vesicles”. Cut from B.M. K30146, x L13. 
Figure 8. Calapoccia canadensis Bill. Part of weathered longitudinal section of a 
specimen from Akpatok island. S.IM. AG687. x 1-25. 
Figures 9a and b. C. catiadensis Bill. Thin sections of the sjntype of "C. kuronensis" 
Billings (Plate I, figures Ga. b). Cape Smyth, lake Huron. G.S.C. 1985, 
X M3. 
