251 



iif tlic oloineiils of tlie skeleton in :i more or less iVagiiientary condition, as is 

 nsual with the Ibssils ()l)taiiu'(l iVoni the greensand excavations. 



Tlic muzzle was very long and narrow; the mandible convex between 

 the teeth; the |)alat(! Hal. The .surface of the muzzle is grooved, not very 

 closely. The teeth are very much curved, and the section of most of the 

 crowns is round ; i)ut a few posterior ones are flattened on the inner side, so 

 that the section is an unsymmetrical oval. These teeth have acute but some- 

 what shortened crowns; the others are long and acuminate. A delicate 

 angular ridge on the front and posterior aspects divides an inner from an outer 

 liice, of which the outer is more convex. The enamel is marked by a number 

 of shallow, obscure sulci on the middle portions of the crown on both faces; 

 while the surface is thrown into tine wrinkles, so as to resemble silk, which 

 disap})ear from the used portions of old crowns. Twenty-one teeth are pre- 

 served, but the entire number is unknown. The crowns are composed of four, 

 sometimes three, coneiMitric cones. 



The vertebrae are remarkable for the strong posterior shoulder of the 

 centrum, so that the protuberant ball presents a moi'e than usually contracted 

 i)ase "^riie ball is strongly impressed by a ligamentous pit in the center. The 

 cervicals are relatively very large, exceeding the dorsals and lumbars. In the 

 oidy one which is nearly complete, the centrum is depressed, and hence the 

 articular faces are transverse ovals. The shoulder is oblique to the verti- 

 cal plane. Surfaces smooth. The cup of the first dorsal is nearly round ; 

 its hypapophysis is long, directed forward, and squarely truncate at the end 

 and in front. The parapophysis is below the middle of the centrum, and 

 longitudinal. There are some liiint ridges extending to the shoulder, and 

 a fossa above each parapophysis. The neural arch is coossified. A more 

 posterior dorsal has a hypapophysis with a very large base. The cup is as wide 

 vertically as transversely, but is, like the centrum, contracted in outline below 

 the middle. The lumbars differ from those of other species of the genus in the 

 shortness of the centrum as compared with its other dimensions. They are 

 compressed ; the vertical diameter exceeding the transverse. Of course, the 

 transverse width is the greater near the .sacrum. In the caudal vertebra?, the 

 balls and cups gradually disappear, until a narrow transverse fossa is all that 

 indicates either. One of the terminal caudals is thus truncate at both ends; 

 has tlie sides of the centrum replaced by a deep longitudinal fossa, the base 

 only having some transverse diameter. The neural canal is a tube, one-half 



