402 



University of California Publications. 



[Geology 



MEASUREMENTS. 

 A. rufa 



A . alexandrae 



Length from anterior side P 3 to 

 posterior margin M :1 



No. 3748* 



18.5 mm. 



No. 11325 

 18.5 



No. 11898 



12.5 



P 4 , anteroposterior diameter 



5. 



4.5 



3.5 



P 4 , greatest transverse diameter.... 



5. 



4. 



4. 



M\ anteroposterior diameter 



4. 



2.5 



2.5 



M 1 , greatest transverse diameter. ... 



4.5 



3. 



4. 



M" anteroposterior diameter 



4. 



2.5 



2.5 



M s , greatest transverse diameter.... 



4.5 



3. 



3. 



M 3 , anteroposterior diameter 



4.5 



3. 



3. 



M 3 , greatest transverse diameter.... 



4. 





2.5 



Length from anterior palatine fora- 

 men to P 3 



11. 





7.5 



Length from anterior palatine fora- 

 men to posterior margin M 3 



29. 





19. 



Greatest width between anterior ex- 

 ternal borders of alveoli of P 4 .... 



16.5 



12. 



12. 



Width of palate on plane of alveoli 









No. 11899 



3.5 

 4. 



between P 3 and anterior palatine 

 foramen 



Width of palate between inner bor- 

 ders of P 4 



Width of palate between inner bor- 

 ders of M 3 



4.5 



4.5 



A . rufa 

 No. 37+8* 



A. alexandrae 

 No. 11897 No 11909 



Total length of inferior cheek tooth series 1 7. i 



P 4 , anteroposterior diameter 5. 



P 4 , transverse diameter 4. 



M„ anteroposterior diameter 4. 



M t , transverse diameter 3.5 



M 2 , anteroposterior diameter 4. 



Mo, transverse diameter 3.5 



M 3 , anteroposterior diameter 4.5 



M 3) transverse diameter 3. 



Height of mandible at P 4 14. 



Length of mandible from condyle to posterior 



margin of incisor alveoli 45. 



11. 



3.5 



2.5 



2.5 



3. 



2.5 



3. 



3. 



2. 



9.5 



31. 



12. 

 4. 



2.5 



2.5 



3. 



2.5 



2.5 



2.5 



Number from Univ. Calif. Mus. Vert. Zool. 



MAXILLARIES. 



In a Meniscomys specimen (no. 1100) the maxillaries meet 

 in a nearly horizontal plane on the palatal surface. 



The maxillaries in A. alexandrae (no. 11898) are keeled medi- 

 ally, anterior to P 3 and back of the anterior palatine foramina 



