An upper Ordovician coral fauna is described, for the first time, from the Lower Mackenzie River area. It consists of twenty-seven different species, twenty-six of which are described and figured.

Correlations with other faunas, particularly in Manitoba are given.

A summary of the "Silurian" faunas previously reported from various localities in the area is given, along with the Ordovician faunules found at the mentioned localities.

The genus Manipora and Catenipora are described at some length. It is concluded that they are both valid and useful genera.

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