148 University of California Publications. [Geology 



Measurements. 



Least width of rostrum in front of zygomatic ar.ches 17.25mm 



Least interorbital width 10 



Length of superior molar-premolar series (except P 3 ) 



measured on alveoli 17.3 



Palatal width between alveoli of P 4 6.25 



Palatal width between alveoli of M 3 6.5 



Distance between alveoli of inferior incisor and P 4 13 



Length of lower molar-premolar series measured on alveoli . . 18 



TEONOMA SPELAEA, n. Sp. 

 PL 19, Pigs. 4-7. 



Type. — No. 5362, Univ. of Cal. Palae. Coll. The anterior two-thirds 

 of a skull of an adult individual, in which the teeth are not much 

 reduced by wear. 



Locality. — Potter Creek Cave, Shasta Co., California. 



Teonoma cinerea is the form nearest to this new species, but 

 the rostrum and incisive foramina are decidedly shorter in the 

 fossil form than in cinerea. Also, the premaxillae extend far- 

 ther back beyond the nasals, the nasals taper more posteriorly 

 and the frontals have a greater interorbital width in the new 

 species than in T. cinerea. 



A large number of lower jaws were found in various parts 

 of the cave. They differ from the typical Teonoma cinerea in 

 having the enamel loops of the molars more evenly balanced 

 on the two sides of the axis of the tooth row. In cinerea the 

 loops are much longer on the inner side than on the outer side. 

 In the cave specimens there is comparatively little difference. 

 As but one species of Teonoma is represented in the Potter 



Creek Cave, the mandibles are also referred to Teonoma spelaea. 



Measurements. 

 Length of rostrum from base of P 4 to anterior surface of 



incisor 19 mm 



Width of rostrum in front of infra-orbital foramina 9 



Depth of rostrum at middle of incisive foramina 9 



Length of incisive foramina 13 



Greatest width measured across both incisive foramina 3 



Width across frontal between orbits 6.5 



Length of superior molar-premolar series measured on alveolar 



borders 10.25 



M 1 , antero-posterior diameter measured on alveolar border .. 4.3 

 M l , transverse diameter measured on alveolar border at widest 



part 2.3 



M J , antero-posterior diameter measured on alveolar border . . 3 

 M 2 , transverse diameter measured on alveolar border at widest 



part , 2.3 



