Department of Vertebrate Paleontology. 



of both from a common ancestor. This species was about 



the size of a cat, and the cast is taken from an incomplete 



skeleton in the American Museum. 



Price, $4. 



Matthew, Revision of the Puerco Fauna, Bull. Amer. Mus. Nat. Hist., 



XI, 1897, p. 305, fig. 12. 

 OsBORN, Remounted Skeleton of Phenacodus, Bull. Atner. Mus. Nat. 



Hist., X, 1898, p. 159. 



37. Stereosternum tumidum Cope. 



Skeleton. 

 Upper Permian, near Sao Paulo, Brazil. 



This beautifully preserved skeleton is one of the most an- 

 cient and primitive reptiles known, and represents a distinct 

 and very primitive order of Reptilia, the Proganosauria, 

 with many characters connecting it with the Amphibia. 

 Skeleton in block, about two feet long, showing all parts 

 except the left fore and hind feet, and with the outlines of 

 the body indicated. By courtesy of the Director of the Geo- 

 logical Survey of Brazil. 



Price, $15. 



Cope, Contribution to the Vertebrate Palseontology of Brazil, Proc. 



Am. Phil. Soc., XXIII, 121, 1885; The Carboniferous Genus 



Stereosternum, Amer. Nat., 1887, 1109. 

 OsBORN, Memoirs Am. Mus. Nat. Hist., Vol. I, Pt. VIII, p. 481, figs. 



15-19, and pi. xl, Nov., 1903. 



II. — Casts of Models of Extinct Vertebr.\tes by 

 Charles Knight. 



Originals presented by J. Pierpont Morgan, Esq. 



No. I. Three-homed Frill-necked Dinosaur. Triceratops 

 prorsus Marsh. 



The original model was made by Mr. Knight for the National 

 Museum, under direction of Mr. Lucas, and is based on parts 

 of several skeletons there preserved. 



