CREODONTA. 341 



MlOCL^NUS BUCCULENTUS Cope. 



Proceedings American Pliiosophical Society, 1883, p. 555. 



Plate XXIV g; fig. '2. 



A part of the right maxillary bone which supports three molars indi- 

 cates this species. The molars are Pm. iv, M. i and M. ii. This series is 

 characterized by the remarkably small size of the fourth premolar, and 

 large size of the second true molar. The first true molar is intermediate. 



The fourth premolar consists of an external cone and much smaller 

 internal one. There is a weak posterior basal cingulum. The reduced size 

 of the internal cone suggests the probability that the third premolar has no 

 internal cusp, and that there may be but three premolars. In the latter 

 ■case the species must be distinguished from Miodcenus. 



The first and second true molars have conic well separated external 

 cusps, and a single pyramidal internal cusp. The intermediate tubercles 

 are distinct. There is a posterior cingulum which terminates interiorly in a 

 flat prominence. There is an anterior cingulum and a strong external one, 

 which form a pi'ominence at the anterior external angle of the crown. En- 

 amel wrinkled. 



Mtasttrements of Superior Molars. 



M. 

 Lenglli of bases of Pm. iv, M. i .and ii 0180 



5 anteroposterior 0040 



diameters Pm. iv ^ ^ransyerse 0046 



) anteroposterior 0060 



Diameters of M. i transverse 0065 



< anteroposterior 0070 



Diameter of M. ii ^ t^^^^^erse 0085 



From the Puerco region of New Mexico, D. Baldwin. 



MlOCL^NUS CORRUGATUS CopC. 



Paleoutological Bulletin No. 30, p. 560, 1883. 

 Plato XXIV g ; fig. 1. 



This species is known from a right maxillary bone which contains the 

 last four molar teeth, with parts of pelvis and other bones of one individual. 

 This species is intermediate in size between the M. protogonioides and M.ferox 

 (see p. 3'25). The superior molars are more nearly quadrate than in the 

 other species of the genus, owing to the better development of the posterior 

 internal tubercle, which is, however, as in the others, a mere thickening 

 of the posterior cingulum. It is wanting from the last superior molar. 



