LAMBDOTHERIUM. 711 



the molar to be oblique to the other sides of the ci'own. The anterior and 

 posterior cingula of the molai's are very strong, but they do not extend 

 quite round the inner bases of the internal cusps. The latter are rather 

 acute, and their opposed faces are flat and meet at an angle. The interme- 

 diate tubercle is large, has a subacute summit and a triangular base. The 

 ridge which passes forwards and inwards from the posterior internal tuber- 

 cle does not reach the external lobe, and rapidly diminishes in elevation. 

 There is no well-defined external basal cingulum. In the superior pre- 

 molars the external cusps are separated by a notch, and have no external 

 ridge between them. Each has a feeble median rib. There are posterior 

 and anterior cingula, of which the latter terminates externally in a low 

 tubercle. There is a low external cingulum, but no complete internal one. 

 The superior premolars have an anterior intermediate tubercle. 



Measurements of separated suj^erior molars. 



Diameters Pm.ii^'^°*«'^"^P°«t«"'"' O-*'"^ 



( transverse 010 



Diameters Pm.iii I ''»*«™P''^*"'°^ «°^ 



( transverse 112 



Diameters Pm.iv I •■'"'""I'«^"^'''°'^ ^^^ 



( transverse 012 



Diameters of true molar ^'^°t"0P''^t'=""'- "^^^ 



< transverse 0160 



Elevation of crown 007 



The ramus of the lower jaw is compressed and quite deep. The coro- 

 noid process rises abruptly from the alveolar border, and the masseteric 

 fossa is little marked. There are two mental foramina, which are below the 

 second and third premolar teeth, respectively. The posterior extremity of 

 the symphysis is opposite the anterior root of the second premolar. This 

 posterior position leads me to suspect that the first premolar may be wanting. 



This tapiroid was about the size of the Ilijrachyics agrestis,hutless robust. 



Wind River Eocene of Wyoming. Found by Jacob L. Wortman, 



Lambdotherium procyoninum Cope. 



Melotheriitm procyoninum Cope, Palseontological Bulletin No. 2, p. 1, August 3, 1872. Proceedings 

 American Philosophical Society, 1872, p. 466. Annual Report U. S. Geol. Survey Terrs., 1872 

 (1873), p. 606. 



Plate XXIV; fig. 22. 



As this species is only known from a superior true molar, its generic 



