120 Annals of the Carnegie Museum. 



of the Carnegie Museum collection and the type of Isectolophus, as 

 well as the American Museum specimen, is the presence of two small 

 mammillary tubercles rising from the cingulum on the antero-external 

 portion of Mg- in the specimen in the Carnegie Museum. These are 

 absent both in the type and in the New York specimen, Xo. 1828, and 

 may well be only an individual character (See Fig. 17). 



The transverse diameter of the distal trochlea of the humerus is 

 unusually small. This fact seems to agree with Osborn's description 

 of the head of the radius {op. cit., p. 521). The trochlea is rather deep, 

 which is due to the very prominent capitellum. There is a decided 

 tubercle on the dorso-ulnar face, just above the capitellum, but there 

 is little or no articular surface on the ulnar side of the capitellum, such 

 as is seen in the tapir, or developed more prominently in the horse. 

 36. Isectolophus scotti^s sp. nov. (Plate XXXIV, Fig. 23). 



Type: Fragments of upper and lower jaws, vertebrae, limb- and foot- 

 bones, described by Professor Osborn as the Paratype of Isectolophus 

 annectens}^^ Natural Science Museum of Princeton University, 

 No. 1 040 1. 



Paratypes: Lower jaw fragment, No. 10399, Natural Science Museum 

 of Princeton University, described by Professor Osborn as Paratype of 

 Isectolophus annectens (/. c, p. 520, PI. X, Fig. 4). Fragments of upper 

 and lower jaws with Mf present. Fragments of vertebrse. No. 31 13, 

 Carnegie Museum. 



Ilorizon: Uinta Eocene. Near base of Horizon C. 



Locality: White River, Uinta County, Utah. 



Specific Characters: No diastema back of loivzr canine: symphysis 

 short and not contracted laterally; canine of proportionally large size; 

 animals smaller than Isectolophus annectens. 



Pending the discovery of complete upper and lower jaws of Isec- 

 tolophus annectens the above determination must be regarded as 

 pro\isional. If the contour of the lower jaw together with the long 

 symphysis, as exhibited in the fragmentary specimen in the American 

 Museum, No. 1928 (See Fig. 17) proves to be the same as in /. 

 annectens, then the new species here erected must take generic rank, 

 as already stated in footnote 94. 



In the specimen, C. M. No. 31 13 (See PI. XXXIV, Fig. 23) the 

 position of the dentition in the alveolar border indicates the same con- 

 's In recognition of Prof. W. B. Scott, of Princeton University. 



'01 Trans. Amer. Philos. Soc, Vol. XVI, 1889, pp. 521-522, PI. X, Figs. 3-8. 



