SPALAX 8U3 



border narrowly rounded ; inner and outer borders about e({ual ; 

 enamel extending slightly on inner and outer sides of tooth, its 

 surface finely rugose with minute longitudinal wrinkles, and light 

 orange in colour. Lower incisor so large that the mandible has 

 the appearance of a mere sheath to the tooth, its root projecting 

 between articular and angular processes as a conspicuous sub- 

 terete capsule, larger and more noticeable than the processes 

 themselves ; length of capsule increasing with age, scarcely or 

 not attaining level of condyles in individuals whose molars are 

 in the early stages of wear, though surpassing this level in 



Spalax (hilbrofjex. Cheek- teeth showing enamel pattern at various stages of wear. 

 Vpper row, maxillary teeth ; lower row, mandibular teeth (semi-diagrammatic). X 5. 



older animals ; section of shaft much as in upper tooth, but 

 antero-posterior diameter relatively greater ; surface of enamel 

 less evidently rugose, and colour whitish or slightly tinged with 

 yellow. Molars with high, sub-terete crowns and short roots, of 

 which there are three in each of the maxillary teeth, the inner 

 root tending to divide longitudinally into two, and two in each 

 of the mandibular teeth, each root tending to divide into two ; 

 size of teeth decreasing from first to third, the crown area of 

 third when unworn about one-half that of first, when worn 

 relatively larger; enamel pattern of")/(' and m^ consisting of two 

 backwardly curving re-entrant folds on outer side and a single 



