176 MEMOIRS OF THE CARNEGIE MUSEUM 



" The palatines are as long as those of carbo, anteriorly narrow and posteriorly 

 wider, conforming in pattern very nearly to those of urile, while dilophus resembles 

 carlo in this respect. 



" The trans-palatine angle is more rounded than in carbo, much more than in 

 urile, resembling in this dilophus. 



" The inner portion of the post-palatine is less produced ventrally than in carbo, 

 and the pterygoid articulation wider and flatter than in carbo, the palatine thus 

 lacking the keel present in carbo. 



"The same differences are found between the same parts of urile and dilophus. 



" The maxillo-jugal bar is as long as that of carbo but more slender. 



"The lower mandible is slightly shorter and decidedly weaker than that of 

 carbo, and the lower mandible of urile is proportionately still weaker than that 

 of dilophus. 



"The dentary portion of the mandible is more deeply grooved along the inner 

 surface than that of carbo, being comparatively the same as in urile. 



"The cutting edges of the mandible are comparatively straight as in carbo and 

 dilophus, but urile differs from all three in having the mandible distinctly recurved. 



"The sternum is transversely flatter than that of carbo, being a trifle more flat- 

 tened even than that of urile. The carina is also shorter than in urile, but in size 

 and general appearance the sterna of perspicillatus and urile resemble one another 

 very closely. 



"From manubrium to meso-xiphoid that sternum is 13 mm. shorter than that 

 of carbo, being exactly as long as that of urile. 



" The proportion of carina to total length is shorter than in either carbo or urile, 

 the sternum from anterior end of carina to mesoxiphoid measuring 2 cm. less than 

 that of carbo and 4 mm. less than that of urile. 



" Between the costal borders the sternum is slightly wider than in either ca.rbo or 

 urile. 



"The rudimentary manubrium, like that of urile, lies in the plane of the body of 

 the sternum, while in carbo and dilophus the manubrium lies in the plane of the 

 keel. 



"If a line be drawn between the costal processes it will be found that the coracoid 

 articulations project less beyond this line and form a more obtuse angle with one 

 another than they do in carbo, and the same is true of urile as compared with 

 dilophus. The sternum is non-pneumatic, as in urile, but in carbo and dilophus 

 good-sized foramina pierce its dorsal face just back of the ridge formed by the cora- 

 coidal groove. 



