106 Annals of the Carnegie Museum. 



Length of mol ar-premolar series 1 68 



Length of premolar series . '. 82 



Length of molar series 96 



Length of neck 260 



Length of femur 250 



Promerycochcerus hollandi sp. nov. 



(Plate XXVIII.) 



(Type No. 1194, Carnegie Museum Catalogue of Vertebrate Fossils.) 



The type, which was collected by the writer in 1902, consists of the 

 greater portion of a skull with a nearly complete mandible, a humerus, 

 the cervical vertebrae, the great portion of a front foot, and a hind 

 limb including the pelvis. From the Canon Ferry Beds (Middle 

 Upper Miocene) at Canon Ferry, about twenty miles east of Helena, 

 Montana. 



Size large ; skull rather heavy and broad ; posterior portion of zygo- 

 matic arches fairly heavy and turned upward ; bones of skeleton heavier 

 than in Promerycochcerus grandis ; anterior teeth not large ; horizontal 

 ramus of mandible rather deep and anterior fossa on ascending ramus 

 large, but not so large as in Promerycochcerus grandis. 



Most of the above characters are those which distinguish this species 

 from Promerycochcerus grandis. There is little difference in the 

 actual basal measurements of the skulls of the types of the two species, 

 but the skull of P. hollandi is broader, not so high, and the zygomatic 

 arches are more widely expanded ; the teeth in P. hollandi are not so 

 large and strong, and the anterior fossa on the ascending ramus of the 

 mandible is not nearly so large. The limbs are nearly the same in 

 length in the two species, but are heavier in P. hollandi. 



Named in honor of Dr. Holland, the Director of the Carnegie 



Museum. 



Measurements. 



mm. 



Length of skull 342 



Length of neck 250 



Width of skull 234 



Length of lower mol ar-premolar series 176 



Length of lower premolar series 81 



Length of lower molar series 95 



