REVISION OF THE GENUS CALAPOECIA BILLINGS 
INTRODUCTION 
Since Lambe’s revision of the genus Calapoecia in 1899 several new 
species have been proposed, and in spite of Lanabe's work nomenclature 
within the genus has become so confused that it is now no longer possible 
to make a satisfactory identification without the genus being completely 
revised. The writer collected material of this genus from the limestones 
in situ on Akpatok island, Ungava bay, Canadian Northwest Territories, 
while he accompanied the Oxford Hudson Straits Expedition in 1931. In 
addition, he has examined as many specimens as possible from other areas, 
as well as such types as still exist. For the opportunity to do this he has 
to thank the trustees and curators of the following institutions who were 
good enough either to loan or give him material (the letters in parenthesis 
after each are for reference in the present text to catalogue numbers of 
specimens). The British Museum (Natural History) (B.M.), Geological 
Survey, Canada (G.S.C.), United States National Museum (U.S.N.M.), 
Mineralogical Museum of the University of Copenhagen (M.M.K.), 
Paleontological Museum, Oslo (P.M.O.), and the Naturhistoriska Riks- 
museets Stockholm (N.R.S.). The Akpatok Island material has been 
deposited in the Sedgwick Museum, Cambridge (S.M.). 
Measurements of corallite diameters are taken at the surface of the 
corallum and refer to the inside (calical) diameter. Tabulae are counted 
in the centre of the corallites. 
GENUS CALAPOECIA BILLINGS J 
Calapoecia Billings 1865; Columnopora Nicholson 1874, 18751, 1875^^ 
1876, 1879, 1889 (but including C. anticostiensis Bill.) ; Houghtonia 
Rominger 1876, Calapoecm Billings, Lindstrom, 1880, 1882 1, 1883, 1889 
(not including Lyopora)', Columnopora Davis 1887; Calapoecia Billings, 
and Columnopora Nicholson, Miller 1877, 1889; Calapoecia Billings, James 
1893; Calapoecia Billings, Whiteaves 1897; Calapoecia Billings, Lambe 
1899; Calapoecia Billings, Etheridge R. 1903; Calapoecia Billings, Cura- 
ings 1908; Calapoecia Billings, Bassler 1915; Calapoecia Billings, Foerste 
1924; Calapoecia Billings, Twenhofel 1928; Calapoecia Billings, Troedsson 
1928. Not Calapoecia Savage 1913. 
Lindstrom (1899) gives the etymology xaXo? da: 0 LXLa. This surely is 
correct and that of Miller (1889, 1877) is not. Miller has xalo? jtoixiXos 
which would give Calopoecila not Calapoecia. Certain authors have 
written Calapoecia or Calapoecia; these, needless to say, are incorrect. 
Genosyntypes: Calapoecia canadensis E. Billings 1865. No figures. 
Calapoecia huronensis E. Billings 1865. No figures. 
Calapoecia anticostiensis E. Billings 1865. No figures. 
Genolectotype: Calapoecia anticostiemis Billings, G. Lindstrom 1883 
[G.S.C. 22671 
