1921] Frick: Faunas of Bautista Creek and San Timoteo Canon 405 



TRILOPHODON (TETEABELODON) SHEPARDI EDENSIS, n. subsp. 



Type specimen. — The portion of a skull and posterior maxillaries, containing 

 the last molar of the left side and a section of that of the right side, Univ. Calif. 

 Coll. Vert. Pal. no. 23501 (fig. 160); two associated molars from the left and the 

 right side respectively, Univ. Calif. Coll. Vert. Pal. 23503, 23504 (figs. 164, 162); 

 and portions of premaxilla and tusks, Univ. Calif. Coll. Vert. Pal. no. 24047 

 (pi. 50), all from Univ. Calif, loc. 3269. 



Referred material. — A lower molar, no. 23502 (fig. 165); portions of a worn 

 upper molar, no. 23505 (fig. 161); parts of three worn molars, nos. 24049, 23507; 

 a small premolar, no. 23506 (fig. 163); the distal portion of a small tusk, no. 

 24050 (fig. 159); the proximal section of a large tusk (specimen not retained, 

 loc. 3265); portions of the supraorbital ridge, no. 24051, loc. 3266, of two scapulae, 

 and various limb and foot elements. All in Univ. Calif. Coll. Vert. Pal.; all from 

 Univ. Calif, loc. 3269, unless otherwise specified. 



Characters. — The last molar with but four main transverse crests, 

 the intermediate molars with three ; the comparative simplicity of the 

 tubercular arrangement, the lack of lateral cingula, and small size of 

 the fourth crest and posterior extremity of the last molar; in moder- 

 ately abraded teeth, the uniform trefoil character of the pattern of the 

 outer lobes in the upper and of the inner lobes in the lower, and the 

 single oval form of the corresponding opposite lobes in both. 



Measurements 





No. 23501 



No. 23503 



No. 23501 



No. 23502 



No. 23505 











Lower 



Upper 







M?? 



Ml? 



molar 



molar 



Anteroposterior diameter 



150 mm. 



128 mm, 



120 mm. 



130 mm. 



— mm. 



Greatest transverse diameter 



80 



84 



84 



(73) 



76 



Transverse diameter at first 













lobe 



42 



71 



62 



56 



73 



Transverse diameter at sec- 













ond lobe 



42 



72 



69 





67 



Height of first lobe 



60 



23 



32 



50 



23 



Height of second lobe 





32 



34 



34 





Distance intervening between inner edges 



of third 



tooth-lobes of 







last molar 75 



Height of second lobe above alveolus 62 



Distance between tusks, measured from center to center, no. 816 316 



Diameter of tusk at alveolus 90 X 100 



Diameter of tusk 200 mm. from alveolus 82 X 100 



Greatest diameter of large tusk of unpreserved specimen 200 



Distal diameter of small tusk, no. 1031 39 X 29 



Length of distal portion of tusk at base. No. 1031 150 



The figure in parenthesis is approximate. 



