7 
C. canadensis var. anticosiiensis Corallitea circular, more or less dis- 
Bill. tant* “costae” and coenenchyme 
present. 
C. canadensis var. anticosiiensis Corallites about 3 mm. diameter; 
forma arctica the peripheral incomplete tabulae 
Troedsson are slightly more numerous than 
in var. anticosiiensis, of which this 
is just a giant form (See page 17). 
Calapoecia canadensis Billings 
(Plate I, figures 1, 3, 5; Plate II, figures 1, 2, 5-9) 
Calapoecia canadensis, C. huronensis Billings 1865; Columnopora 
cribriformis Nicholson 1874, 1875^, 1875^, 1879; Houghtonia huronica 
Rominger 1876 {in parte); C. cribrijormis Lindstrom 1882; Col. rayi {in 
parte) and C. cribriformis Davis 1887; C. canadensis, C, huronensis, 
C, cribrijor^nis, Miller 1889; C. canadensis (ex Billings) Whiteaves 1897; 
C. canadensis (ex Billings) Larabe 1899 (not including C. anticosiiensis) ; 
C. canadensis Schuchert 1900; C. borealis Whitfield 1900 {in parte, i.e. 
figures 3, 5, 6) ; C. cribriformis and C. canadensis Foerste 1903, 1909, 1917, 
1924; Columnopora cribriformis Cumings 1903; C. canadensis (not includ- 
ing C. anticosiiensis), C. borealis {in parte) and C, cribriformis Bassler 
1915; C. huronensis, C. borealis {in parte) Troedsson 1928 (i.e. Plate 33, 
figures 2a, b; Plate 34, figures 2, 3; Plate 36) ; C. anticosiiensis {in parte) 
Twenhofel 1928; C. canadensis Kiaer 1930, not C. canadensis Holtedahl 
1913, 1917. 
Holotype and all author's types of this species are lost.i 
Neotype here selected is G.S.C. 1136b from Paquette rapids, near 
Ottawa. It is not an altogether satisfactory specimen for it is silicified, 
but this is the disadvantage attendant on a selection from the type locality. 
Diagnosis. Calapoecias that have corallites in contact and no coenen- 
chyme. 
Horizon. C. canadensis is found typically in Black River and Rich- 
mond strata. 
DESCRIPTION OF C. CANADENSIS 
The coralla are radiating masses, sometimes reaching a fairly large 
size. A very typical shape assumed is that of an irregular sphere some- 
what elongated along one axis, with calices opening all over the surface; 
but the coralla may be tuberose or originally encrusting and growing 
around corals, bryozoa, or even pieces of limestone. The corallites, as 
seen on the surface, are in contact and may be polygonal or circular; in 
the latter case the wall is thickened in the angles. The maximum diameter 
of corallites in a colony varies from 1*5 mm. to 3 mm. over the specimens 
that have been examined, but there may be considerable variation in a 
single corallum. New corallites arise between pre-existing ones and not 
by fission. With variations in size of corallites there is not a corresponding 
^ Personal communication 1934 from Mr. E. M. Kindle of the Geological Survey, 
Canada. 
