712 E. C. CASE 



latter genus in the abscence of a coossified odontoid process. Either that 

 element is entirely wanting or it consists of two pieces, interrupted in the 

 middle by the notochordal foramen, and in correspondence with superior 

 articular facets. There is no true hypapophysis of the axis, and the only indi- 

 cation of lateral processes is a small articular facet on each side' on the lower 

 part of the rim of the posterior funnel. These may have been related to 

 rudimental cervical ribs. The neural arch is broken off. 



The dorsal vertebrae have their sides somewhat contracted ; in one speci- 

 men the inferior face is rounded, in another, which I suppose to belong to a 

 different part of the column, it is longitudinally acute. In this and another 

 dorsal, where the parts are exposed, the floor of the neural canal is inter- 

 rupted by a deep fissure, which has a triangular shape with apex downward 

 when seen in profile. This is due to the fact that the opposite halves of the 

 centrum are united by the circumferences of the articular cups, which have 

 in profile an X shape, The diapophysis does not project far beyond the base 

 of the neural arch and is compressed. The caudals are elongate, and resem- 

 ble, in the forms of the centrum and neural arch, those of Lcelaps. The 

 neural spines are not preserved, but if present were directed well backwards, 

 bearing the posterior zygapophyses, since the arch stands only on the anterior 

 three-fifths of the centrum. Chevron facets are not distinct, but two emargi- 

 nations on the rim of the posterior face of one of the vertebras indicate their 

 existence. In other centra even these notches are wanting. The tail was 

 evidently tapering. There is no evidence of the transverse fissures seen in 

 Sphenodon and many Lacertilia, nor are there any diapophyses on the 

 caudal vertebrae preserved. 



Specific characters : "There is a shallow fossa in the entering angle 

 between the superior and inferior articular facets of the front of the axis, and 

 the centrum of the same is obtusely keeled below. The border of the anterior 

 face of the dorsal vertebras with keeled centrum is undulate. The obtuse 

 inferior face of another dorsal is rugulose, and the edge of the face is not 

 undulate. The inferior faces of the two caudals are marked with fine par- 

 allel grooves, while in another caudal and the (?) sacrals the same is smooth. 

 There are some longitudinal ridges on the upper side of the larger caudal." 



MEASUREMENTS. 



" Length of centrum of axis ----- .oo6 m 



Width do. at middle behind - - - - .008 



Depth do. (oblique) - - - - - - .010 



Length centrum of sharp keeled dorsal - .014 



Depth do. behind - - - - - - - .012 



Width do. behind - - .012 



Length centrum rounded dorsal - - - - .012 



Depth do. behind - - - - - - .011 



Width do. behind ... - - .010 



Width neural canal do. - - - - .004 



