Department of Vertebrate Palceontology. 



simulated the Giraffe in the extreme elongation of the neck 

 and legs, and equalled it in size, the hind limb being over 

 seven feet long. It is a most instructive example of parallel- 

 ism, as well in its points of difference from the Giraffe as in 



the resemblances. 



Price, $12. 



Matthew, Mem. Am. Mus. Nat. Hist., Vol. I, Pt. vii, 1901, p. 429, pi. 

 xxxix. 



II. Dissacus saurognathus Wortman. 

 Lower Jaw. 



Am. Mus. No. 2454. Type specimen. 



Dissacus was the largest and one of the most characteristic 

 Creodonts of the Torrejon horizon of the Basal Eocene. It is 

 believed to have been the direct ancestor of the great Mesonyx 



Fig. 2. Dissacus saurog^nathiis. Lower jaw. Basal Eocene (Torrejon or Upper Puerco) 

 New Mexico. Three tenths natural size. 



of the Middle and Upper Eocene. This very perfect lower 

 jaw, sixteen inches long, is the best specimen of the large 



species. 



Price, $8. 



Matthew, Bull. Am. Mus. Nat. Hist., 1897, p. 286, fig. 9. 



