MAKYLAND GEOLOGICAL SUKYEY G9 



" In the foriiier, the spinous process excepting its base, the trans- 

 verse processes, the articular or oblique processes excepting part of 

 the right anterior and left anterior, and right anterior margin of the 

 body, with the corresponding lateral tubercle, are broken away. In 

 form and general proportions, it bears a great resemblance to the 

 corresponding vertebra of the Crocodilus gangeticiis, and the most strik- 

 ing difference is observable in the spinal canal, which in the former is 

 cordiform or trilateral with rounded angles and the apex downwards, 

 while in the latter it is reversed. Judging from its base, the inferior 

 spinous process has been relatively thicker and 2iot so broad as in 

 Crocodilus gangeticus or Alligator lucius. The junction of the body 

 is hemispherical. The lateral tubercle for the head of the lob is 

 formed upon a relatively broad base. 



Measurements. 



Length of the body from the bottom of the con- 

 cavity to the summit of the convexity 3 inches (75 mm.) 



Length laterally, exclusive of the convexity 3 inches (75 mm.) 



Depth of concavity 10 lines (20 mm.) 



Vertical diameter of concave extremity has been 



about 3 inches (75 mm.) 



Transverse diameter of concave extremity 3 inches (75 mm.) 



Vertical diameter of convexity at base 2 in. 2 1. (54 mm.) 



Transverse diameter of convexity at base 2^ inches (62 mm.) 



Transverse diameter of body at middle from one 



suture to the other 3 inches (75 mm.) 



Antero-posterior breadth of base of spinous pro- 

 cess 22 lines (44 mm.) 



Vertical diameter of spinal foramen 14 lines (28 mm.) 



Transverse diameter of spinal foramen 1 inch (25 mm.) 



" The other vertebra, represented in Fig. 5, consists of the body only 

 with the abutments of the neural arch and a small portion of the right 

 anterior articular process. It is more compressed at the sides than 

 in Crocodilus gangeticus, and therefore appears relatively deeper and 

 narrower. 



