12 
Calapoecia canadensis var. ungava nov. var. 
(Plate III, figure 2) 
Houghtonia huronica Rominger 1876 in parte (Plate III, figure 4) ; 
C. canadensis Lambe 1899 (ex Billings) in parte; transitional specimens 
from East Selkirk, Manitoba; probably C. bm'ealis Troedsson 1928 {in 
parte i.e. Plate 34, figure 1 ; Plate 35) (page 45) ; Calapoecia resembling 
huronensis and anticostiensis Darton 1906, 550. 
Diagnosis. Calapoecias intermediate in structure between the typical 
C. canadensis Bill, and C. canadensis var. anticostiensis Bill. 
It has been found, through the study of many thin sections, that, 
although in the majority of cases C. canadensis Bill, and the form imme- 
diately to be described as C, canadensis var. anticostiensis Bill, are dis- 
tinct, there are coralla that show in different parts the structure of both 
of these. This proves that C. canadensis var. anticostiensis is a variety 
of C. canadensis and not a distinct species (that the reverse is not true, 
S>ee section on Variations in Calapoecia). It is proposed that the inter- 
mediate specimens, which could be identified equally well with both the 
above forms, should be placed in a new variety. 
The obvious varietal name is intermedia. But this is preoccupied 
as the trivial name to a Columnaria (Sherborn 1927) and it is desirable, 
therefore, that it should not be employed here. Since the other trivial 
and varietal names in this genus are geographical, the precedent has been 
followed here. Akpatok island, the loeality from which intermediate 
forms have been collected, is in Ungava bay, and the varietal name ungava 
is proposed. 
No description of the variety is necessary. Specimens of it have been 
examined from Akpatok island (S.M. A6697, A6698, A6695, A6696) and 
Credit river, west of Toronto, Canada (B.M. R21448, R21449). Probably 
the specimen figured by Rominger (1876, Plate III, figure 4) should be 
referred to this variety, and certainly those specimens from East Selkirk, 
Manitoba, mentioned by Lambe (1899, 45), and the specimen found by 
Ulrich in the top of the Bighorn limestone, near the head of Lee creek, 14 
miles northeast of Tensleep, Wyoming (Darton 1906, 550). 
Calapoecia canadensis var. anticostiensis Billings 
(Plate I, figure 6; Plate III, figures la-c, 3d, 5a-c, 6, 7) 
Calapoecia anticostiensis Billings 1865, 1866; C. ampkigenia Lind- 
strom 1880; Houghtonia cf. huronica Rominger, Sardeson 1896; C. cf. 
anticostiensis Kiaer 1897; C. canadensis Lambe 1899 (ex Billings; in 
parte)] C. canadensis Kindle 1911; C. canadensis Holtedahl 1913, 1917; 
C. anticostiensis Bassler 1915 (ex Billings; in parte); C. anticostiensis 
Foerste 1924; C. anticostiensis Twenhofel 1928 {in parte); and probably 
C. borealis Troedsson 1928 {in parte; i.e. Plate 38, figs. Ic, Id). 
Diagnosis. Calapoecias with circular corallites, more or less distant. 
“ Cost® ” and coenenchyme are present. 
Horizon. C. canadensis var. anticostiensis is characteristic of post- 
Trenton and Richmond strata. 
