104 Annals of the Carnegie Museum. 



Promerycochoerus hatched sp. nov. 



(Plate XXVI.) 

 (Type No. 1303, Carnegie Museum Catalogue of Vertebrate Fossils.) 



The type is a nearly complete skull with the mandible. It was 

 collected by the writer in 1902 from the same deposits and the same 

 locality as the types of Promerycochoerus grandis, P. hollandi, and the 

 species of Merycoides described in this paper. 



The general form and proportions of. the skull are very much like 

 those of Promerycochoerus grandis but it is much smaller and the teeth 

 are decidedly less heavy than in that 'species, the post-glenoid proc- 

 esses are not antero-posteriorly compressed, the antero-posterior diam- 

 eter being nearly as great as the transverse, the zygomatic processes of 

 the squamosals are slender, and the infraorbital foramen is about the 

 interval between P^ and P^, not over the space anterior to Mi. The 

 anterior contour of the chin is straight, not concave, and the angle of 

 the mandible is large. The upper portion of the ascending ramus is 

 not like that of Promerycochoerus grandis but is much like the usual 

 form in Merycoidodonts. The fossa postero-superior to the last molar 

 is only slightly if at all enlarged. There is no median inner ridge or 

 accessory cusp on P-3-. The outer face of the outer crescent of P^ is 

 more concave than in the corresponding tooth of Promerycochoerus 

 grandis and the median outer pillars on the molars are inclined more 

 forward, while the anterior pillars on the last two molars incline more 

 backward. The lower premolars are thin, being laterally compressed. 



Named in honor of the late J. B. Hatcher, of the Carnegie Museum. 

 Measurements. 



mm. 



Length of skull, greatest 291 



Length of skull, basal measurement 280 



Depth of skull, including angle of mandible 1 90 



Length of molar-premolar series 145 



Length of premolar series 069 



Length of molar series 076 



Length of last molar 035 



Height of last molar 016 



Promerycochoerus grandis sp. nov. 



(Plate XXVII.) 

 (Type No. 990, Carnegie Museum Catalogue of Vertebrate Fossils.) 

 The type which was collected by the writer in 1902, includes a 

 skull with mandible, cervical and lumbar vertebrae, a femur, a 



