Natural History of the Mammalia of India and Ceylon

Family Lagomyidæ — The Pikas, or Mouse-Hares

One or two premolars above and below; grinding teeth as in Leporidæ; skull depressed; the frontals are contracted, without the wing-like processes of the hares; a single perforation in the facial surface of the maxillaries; a curious prolongation of the posterior angle of the malar into a process extending almost to the ear tube, or auditory meatus; the basisphenoid is not perforated and separated from the vomer as in Lepus; the coronoid process is in the form of a tubercle; the clavicles are complete; ears short; limbs nearly equal; no tail.