IN his memoir on the Vertebrates of the Quercy Phosphorites, Dr. Filhol has described two species which he refers to the genus Cœnotherium, viz. C. commune and C. elongatum. Of the former only one ramus of the mandible is figured, and it is referred to a varietal form under the name of procommune: the latter, which is a small form, is known by the cranium and mandible. Both species have no diastema in the dental series. In addition to these, two small species are referred to the genus Plesiomeryx, under the names of P. cadurcensis and P. quinquedentatus, the latter being known only by the mandible; these forms are distinguished from the true Cænotherium by the presence of a diastema between the earlier premolars.