130 



ON THE EXTINCT MAMMALIA OF 



ascertained, they resemble in their order and form those of the preceding species of 



Lejjiauchenia. 



As indicated in the preceding pages, the fossils of Lejiiauchenia are too much muti- 

 lated and otherwise imperfect to obtain accurate measurements in all cases, so that 

 the following comparative list of those species must be regarded as approximative 

 only: 



Estimated length of skull from summit of inion to upper 



incisive alveoli. 

 Estimated breadth at post-orbital arches, 

 Estimated breadth at infra-orbital arches, 

 Breadth of forehead between the orbits, 

 Length of do. in median line, 

 Breadth of face at last molar alveoli, 

 Breadth of face at infra-orbital foramina, 

 Breadth at canine alveoli. 

 Length of upper alveolar border, 

 Depth of lower jaw below middle of last molar. 

 Depth at second premolar. 

 Depth at condyle. 

 Length of upper molar series. 

 Length of lower molar series. 



The following list of measurements is taken in the case of the two larger species 

 from well-preserved specimens belonging to different individuals : 



L. major. 



L. decora. 



Lines. Lines. Lines. 



Length of the upperniolar series, . 32 31 22 



Length of upper true molar series, .20 19 15 



Antero-post. diameter of last upper molar, 8J 7i 



Transverse " " " 7* gj 



Antero-post. diameter of second upjier molar, 7 J 6 



Transverse " " " 7 5i 



Antero-po.st. diameter of first upper molar, 5 J 4 J 



Transver.se " an (^| ^| 



Antero-post. diameter of last upper premolar, 3* 3 J 

 Transverse " " " 5 



Antero-post. diameter of third upper premolar, 4 4 



Ant.-post. diameter of second upper premolar, 3* 3^ 



Lines. 



14 

 Qh 

 5i 

 5i 

 5i 



21 

 Si 

 21 

 2i 



L. nitida. 



Lines. 



17 



9^ 

 4 



3i 



2J 



