35 
confirm the age of Lambe’s Black River exposures, but from Foerste's 
(1924, 50) account of the Richmond of lake St. John it seems very much as 
though Lambe were regarding Richmond strata as Black River. Foerste 
does not mention Lambe’s “Black River" of this locality. i With regard to 
Foerste’s alleged Black River Calapoecias, the lowest beds on Anticosti are 
the Macasty Black Shales, probably equivalent to the Utica or Colling- 
wood shales of Canada (Twenhofel 1926, 63), and Calapoecia is not re- 
corded from them. The strata following these shales are Richmond. A 
Black River age for the rocks exposed at the north end of lake Huron was 
suggested by Bell (1898, 23 I) whose only mention of the fauna was “A 
considerable number of rather poorly preserved fossils have been collected 
from these beds. They belong to the Black River and Birdseye formation 
of the Trenton group." Foerste (1932, 55-6) records C. canadensis {C. 
cribrijormis) from the Black River of Cloche island. 
In view of the similarity of Black River and Richmond fauna, now 
well-known (Ulrich 1911, Foerste 1924), one is reluctant to accept early 
accounts of Black River strata as correctly correlated until they have been 
confirmed by later work. 
SUMMARY 
The genus Calapoecia Billings is revised and redescribed in this paper. 
It is found to be characterized by the presence of a very open stereozone 
bounding its corallites, and twenty, short, wedge-shaped septa rising 
periodically from the septal ridges, which alone make the corallite “ wall." 
This coral is regarded as a somewhat aberrant Tabulate. 
From a study of many specimens (including types) and thin sections 
the conclusion is drawn that there is only one species, C. canadensis Bill., 
and from this variations arise. Accordingly the following forms are 
recognized, certain “species" being regarded now as varieties or less: 
C. canadensis Bill., C. canadensis var. ungava (nov. var.), C. canadensis var. 
anticostiensis Bill., C. canadensis var. anticostiensis forma arctica Troedsson. 
The synonymy and all available accounts of the genus and species are 
discussed in detail, with the result that the following species become 
synonyms of those listed above: Columnopora cribrijormis Nicholson, 
Col. rayi Davis, Houghtonia huronica Rominger, Calapoecia borealis Whit- 
field. “Calapoecia favositoidea " Savage is found to be a Paleojavosites and 
not a Calapoecia. 
The genera Lyopora and Sarcinula “ Spring ophy Hum ” are considered 
in detail from actual examples (L. favosa (M’Coy) and S. organum 
(Linn.)), for comparison with Calapoecia. It is concluded that Lyopora 
cannot be regarded, at the present at any rate, as synonymous with this 
genus; and that Sarcinula, although showing some interesting similarities 
in structure, is not congeneric with Calapoecia. It was formerly thought 
to be congeneric with “ C. anticostiensis " Bill, 
1 1 have since received a letter from Miss A. E. Wilson of the Canadian Geo'logical 
Survey which confirms my suspicion of the Richmond age of Lambe’s Lake St. John 
exposure. Further, Miss Wilson tells me that the other localities of Lambe from Ottawa- 
Hull west, and the locality of Billings are regarded as Black River. She mentions a 
Black River specimen from Carden township, also southeast of Peterborough, identified 
by Dr. Raymond. 
