... No. 3952, with nasals, maxillary teeth, and lower parts of braincase missing and zygomata broken; four rami (unnumbered), one of which is badly broken; and two isolated molariform teeth. The skull has a sphenoidal fissure, a feature typical of the umbrinus group of Thomomys. The fossil specimens closely approximate in size the living subspecies Thomomys umbrinus analogus Goldman. Thomomys is not known from the vicinity of the cave at the present time and has ... — Pleistocene Pocket Gophers From San Josecito Cave, Nuevo Leon, Mexico • Robert J. Russell
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