46 
PL.VTE III 
C. canadensis var. anticostiensis Bill., C. canadensis var. ungava nov. var., and 
Plasmoporelia convexotahulata Kiaer 
Figures la, b, and c. C. canadensis var. anlicostiensis Bill. Thin sections of Billings’ 
holotype of "Calapoecia anticostiensis". G.S.C. 2667a, x 1‘13. 
Figure 2. C. canadensis var. nngava nov, var. Credit river, near Toronto, Canada, G. J. 
Hinde Coll. Cut from Bjk. R21448, x 1‘13. 
Figure 3. C. canadensis var. anticostiensis Bill. Thin .section of a small colony from 
Akpatok island, N.W.T. S.M. A6692c. Drawn on a camera lucida, x 1-13. 
Figures 4a and b. Plasma porella convexotahulata Kiaer. Thin section of a metatype. 
Stage 5a, Stravnestangen, Ringerike, near Oslo. P.M.O. 13485 (S.M. A66^ 
c and d), x 1'13. 
Figures 5a, b, and c. C. canadensis var. anticostiensis Bill. Thin sections of a specimen 
collected by Sohei from Norman Loekyer island, Ellesmere island. P.M.O. 
A8616, X 1-13. 
Figure 6. C. canadensis var. anticostiensis Bill. Thin .section of a specimen from West 
cape, Anticosti island. Division B. G. J. Hinde Coll. Cut from B.M. 
R21535, X 1-13. 
Figure 7. C. canadensis var. anticostiensis Bill. Longitudinal section of a specimen from 
Akpatok island, N.W.T. S.M. A6693c, x 1-13. 
