196 Annals of the Carnegie Museum. 



sacrum [of this individual]. The caudal region was of medium length, 

 judging from the four anterior caudals which are at hand. The 

 thoracic [and abdominal cavities are] of large size. The limbs are 

 short and heavy, . . . [the feet are short and broad] and the propor- 

 tions of the skeleton recall the outlines of the hippopotamus." 



Measurements. 



Cm. 

 Skeleton, total length, approximately 172 



Skeleton, height at first dorsal 72 



Skeleton, height at points of ilia 68 



Models of Promerycochcerus Carrikeri Peterson.^* 

 (Plates XXXVI and XXXVII.) 



Models based upon the skeletons described in the preceding pages 

 were placed upon exhibition in the Hall of Mammals in the Gallery of 

 Vertebrate Paleontology of the Carnegie Museum in 1909. They were 

 made by Theodore A. Mills under the supervision of Dr. W. J. Holland 

 and the writer. They are believed to portray with considerable 

 accuracy the proportions, shape, and positions of these animals in 

 life. The skull represented in Plate XXXV is too small, and another 

 skull of more nearly the proper size was used in preparing the models. 

 Apart from this change the articulated skeleton, and the three speci- 

 mens In the original position on the sandstone slab were closely followed. 



As may be gathered from the foregoing pages there are a number of 

 features in Promerycochceriis which are hippopotamoid. The animal 

 had a heavy and short neck, a long and heavy body, short legs, and 

 broad and tetradactyl feet. The high sagittal crest, high, broad, and 

 rugose occipital plate, together with the broad mastoid plate suggest 

 that the muscles of the neck were heavy; while the deep supratemporal 

 fossa, greatly expanded zygomatic arches, and deep excavations on 

 the internal face of the angle of the lower jaw indicate thick and heavy 

 masseteric muscles. Add to these characters the extremely heavy 



15 It is of interest to note the close similarity of the model figured on Plate 

 XXXVI to the figure by Charles R. Knight given in Osborn's "Age of Mammals." 

 p. 236. This paper was in manuscript, and the model in the Carnegie Museum 

 on exhibition long before Professor Osborn's book appeared, and we had no knowl- 

 edge that a restoration of Promerycochcerus was being made in the American 

 Museum of Natural History. It is therefore gratifying to observe that the con- 

 clusions independently reached by our friends in New York as to the external 

 appearance of the animal so closely agree with our own. 



