252 



of which is roofed by a saddle-shaped body, and the opposite end supports 

 the vertical spine, which is connected with the former by a lamina. 



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

 shaft. Like all the Jong bones, the dense layer of bone is thin, and the tissue 

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

 subtriangular in outline, obtuse in front, with a rudimental cneniial 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. 



M. 



Length of the space containing three teeth 0. 036 



AVidth of the under jaw at the same noiot .• 0. 035 



Length of a tooth on the curve •. 075 



Length of the crown of the same 0. 033 



Diameter of the crowu of the same 0.011 



Length of a cervical vertebra 0. 004 



Vertical diameter of the centrum 0. 053 



Transverse diameter of the centrum 0. 068 



Length of the first dorsal 0. 075 



Vertical diameter of the cup of the ccDtrniu 0.055 



Transverse diameter of the cup of the centrum.. 0. 057 



Length of the posterior dorsal 0. 080 



Vertical diameter of the cup 0. 050 



Transverse diameter of the cup 0. 05'2 



Length of the centrum of a lumbar . 0. 075 



Vertical diameter of the cup of tin- same 0. 052 



Transverse diameter of the cup of the same 0. 049 



Greatest diameter of the head of the femur 0. 078 



Least diameter of the head of the femur 0. 047 



Diameter of the shaft of the lemur 0.018 



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



Diameter of the head of the tibia, transverse .- 0. 0GO 



This species, in its transverse cervical articular cups, resembles the Tlio- 

 racomurus neocasariensis ; bul the diameters of the dorsal vertebras referred 

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

 the former in H. pneumaticus. This gavial also differs in the more acute and 

 cylindric crowns of the teeth, as is the case with other Ha/opes; while in the 

 T. neoccesariensis the} are more -compressed and obtuse. I am not able to 

 determine the presence or absence of the lachrymal fossa. 



The greensand bed No. 5, near Harrison ville, New Jersey. Discovered 

 by my friend Barclay Edwards. 



HoLOPS BEEVISPINIS, Cope. 



Proceedings of the Academy of Philadelphia, 1867, p. 39 (Thoracosaurus) ; Extinct Batraehia 

 and Eeptilia of North America, 1869, p. 60. Plate I, fig. 13, and IV, 4-6. 



