The dentitions of 43 of 1226 caribou (Rangifer tarandus) skulls examined had anomalies. Of the 43, 13 had supernumerary teeth, 25 had missing teeth, and five had extreme variations in root development and abnormal dentary patterns. These anomalies appear to be genetically produced and further study from the standpoint of evolutionary origin might be fruitful. sented. The 1176 caribou were taken from the Kaminuriak population, which calves and summers in the District of Keewatin, Northwest Territories, and winters for the most part in northwestern Manitoba and northeastern Saskatchewan. The 50 caribou were from a herd that is resident in north-central Baffin Island. Anomalies in the dentitions of Cervidae are generally uncommon. They are regularly reported in Odocoileus, a genus in which maxillary canines, in particular, appear with some frequency. Canines in the maxillae are normal in the genus Rangifer, the accepted dental formula for which is 0/3, 1/1, 3/3, 3/3 = 34 (Banfield, 1961:26). The associated maxillae, mandibles, and anomalous teeth were examined for evidence of the possible origin of anomalies from trauma. The incisiform teeth were extracted. The absence of normal sockets or the presence of extra sockets was determined, as was the possible migration of incisiform teeth due to the absence of one or more teeth from the incisiform row. The classification of the present or absent tooth was based on the form, size, and position of existing teeth.