252 



of wliich is rooird l)y a saddle-shaped l)ody, and tlir opposite end supports 

 the vertical s})ine, wliicli is (■oiinected with the former by a lamina. 



Tlie femur is large and has the form usual in the order, and has a hollow 

 shall. Like all the long bones, the dense layer of bone is thin, and the tissue 

 light; surface near articulations always striate-ridged. The tibia has a head 

 subtriaiigular iu. outline, obtuse in front, with a rudimental cnemial spine 

 turned outward, and an open emargination behind. It is penetrated near the 

 anterior angle by a large pneumatic foramen, and the shaft is hollow. 



The dermal scuta have free, thin margins, and they are coarsely and 



deeply pitted. 



Measurements. 



ir. 



Length of tbe space coutaiuiuj; Uiroe teeth 0.0 ■iG 



Width of the uuder jaw at the same point 0. Olio 



Length of a tooth ou the curve 075 



Leuj^th of the crowu of the same 0. 0;S:! 



Diameter of the crowu of the same 0. (Ill 



Leugth of a cervical vertebra .. . 0. 094 



Vertical diameter of the ceutriini 0. 053 



Transverse diameter of the centrum 0. OSS 



Length of the iirst dorsal 0. 07.''> 



Vertical diameter of the cup of the centrum ....- 0. O.'iS 



Transverse diameter of the cup of the centrum 0. 057 



Leugth of the posterior dorsal 0. 080 



Vertical diameter of the cnp 0. 0,")0 



Transverse diauieter of the cnp 0. U52 



Leugth of the ceutrum of a Inmbar 0. 075 



Vertical diameter of the cup of tlie same 0. 0.')2 



Trausverse diameter of the cup of the same 0. O-li) 



Greatest diameter of tbe bead of the femur 0. 078 



Least diameter of tbe bead of the femur 0. 0-17 



Diameter of tbe shaft of the fenutr 0. 04M 



Diameter of the head of the tibia, longitudinal 0. 057 



Diameter of tbe head of the tibia, transverse 0. 000 



This species, in its transverse cervical articular cups, resembles the Ti'io- 

 rncomurus neoccesariensis ; but the diameters of the dorsal vertebrpe referred 

 to that species by Leidy exceed those of the cervicals, while the latter e.Kceed 

 the former in H. pneumaticus. 'Wis gavial also difi'crs in the more acute and 

 cylindric crowns of the teeth, as is the case with other Holojies; while in the 

 T. neoc(Esnriens\s they are more compressed and obtuse. I am not able to 

 determine the jiresence or absence of the lachrymal fossa. 



The greensand bed No. 5, near Harrisouville, New Jerse3\ Discovered 

 by iny friend Barclay Edwards. 



HOLOPS BREVISPINIS, Cope. 



Proceedings of the Academy of Philadelidua, 1867, p. '.\^ ('Tlioracoaaurns) ; Extinct Batrachia, 

 and Keptilia of North America, ISm, p. 69, Plate 1, lig. K!, and IV, 4-0. 



