Published online by Cambridge University Press: 01 May 2009
THE fossil material collected from the Ordovician limestones of Akpatok Island, N.W.T., by Mr. Ian Cox during the Oxford Hudson Straits Expedition in 1931, included a specimen whose affinities could not be determined from a superficial examination. In asking me to report on the Polyzoa from these rocks, Mr. Cox suggested that I might also investigate this doubtful form, since it resembled in many respects certain massive Polyzoa. Critical examination by means of thin sections has shown, however, that it is not a Polyzoan but a Tabulate Coral referable to the genus Chaetetes.