71 



sory tubercle just at the lip of the anterior lobe, and there is 

 another on the anterior basal ridge. This latter feature 

 would seem to distinguish it from U. robustiun. 



The basal ridge is distinct in front and behind, indistinct 

 on the external side, and entirely absent from the internal. 



Measiircmoits. 

 (teeth, lower jaw.) 



M. 



Transverse diameter of last molar -026 



Height of highest point above cingulum of last molar 023 



Fore-and-aft diameter of second molar 0285 



Transverse diameter of second molar 023 



Height of second molar 0215 



Length of fourth premolar 021 



Width of fourth premolar 015 



Height of fourth premolar 020 



Length of third premolar 020 



Width of third premolar -015 



Height of third premolar 014 



Vcrtcbrce. 



Cervical region (Plate VI., Fig. i). — (Only one preserved^ 

 probably fifth or sixth.) 



The centrum is short, compared with the dorsals, but is 

 much longer than the cervical centra of the Proboscidea ; it is 

 broad and depressed, oval in form, and slightly opisthocoelous. 

 The zygapophyses are developed upon tuberous projections 

 of the pedicles ; they are large, flat, and in the same plane with 

 each other. The diapophyses are very slender and short, and 

 but slightly heavier than the parapophyses, with which the}- 

 unite, enclosing a large vertebraterial canal. At the anterior 

 margin of the parapophysis, a small pointed process projects 

 downward. 



The pedicles are low and very heav\', bounding a narrow 

 neural canal. 



The epiphyses are not so completely ossified as they are 

 in the dorsal region. 



Dorso-liunbar region (Plate VI., Figs. 2, 3, 4, 5), — (Descrip- 

 tion based upon nine dorsals and two lumbar vertebrae.) 



The centra are large, subtriangular, and slightly com- 



