Since the original foundation of the genus Dichobune by Cuvier, and the critical observations made thereon by Owen, the national collection has continued to receive new accessions, indicating the existence of a certain range of variation in the molars of that genus.
The specimen (No. 30673) in the British Museum collection, is figured in Plate II., by Mr. Mackie. It consists of the three molars of the right side of a species of small quadruped closely resembling Dichobune. The length of the fractured ramus containing these teeth, of which the inner aspect is exposed to the observer, measures 27mm.; its greatest vertical depth between the penultimate and last molar being 11mm.
The last molar (m 3) measures 7mm. in length, and 4 in breadth. Its form is quadricuspid; the two outward cusps being least eroded; from the ectoposterior cusp is developed a slight basal talon, extending towards the entoposterior cusp, which is the smallest of the four, pyramidal, and acuminate; the entoanterior cusp is larger, and is tipped with a small exposed ring of enamel; the ectoanterior cusp is much worn; there is no trace of the distinct hinder lobe of Xiphodon, which lobe in the Dichobune (sp. ?) from Hordwell, marked 29714 in the British Museum, exhibits a well-marked bicuspid division, having the effect of rendering the ultimate molar in that specimen virtually hexacuspid, to a greater extent than in the Dichobune ovina.