126 Kansas Academy of Science. 



praoccipitals above there is a small canal or foramen leading for- 

 ward into the brain cavity. Near the proximal end of the process 

 there is also a foramen, for the vagus. 



The mandible is wholly concealed from view above, articulating 

 posteriorly by an hour-glass-shaped concavity with the quadrate. 

 A differentiation of its elements I have not yet been able to make 

 out, though I have a half dozen or more specimens in good preser- 

 vation before me. At the anterior end of the mandible there is a 

 second row of five small teeth, parallel with the outer or marginal 

 row and situated close to the inner border. 



VERTEBRA. 



mm. 



Length of atlas 20 



Greatest expanse of same 32 



Length of second vertebra 11 



Expanse of transverse processes 46 



Length of third vertebra 13 



Expanse 48 



Length of fourth vertebra 14 



Expanse 50 



Length of fifth vertebra 17 



Expanse 48 



Length of sixth vertebra 20 



Expanse 48 



Length of seventh vertebra 21 



Expanse 46 



The atlas and the second vertebra are occasionally coossified, 

 and Cope has mentioned the fact. Usually, however, they are 

 separate, as is evidenced by six well-preserved specimens of the 

 atlas before me. The figures (1, 4), together with Cope's descrip- 

 tion, will suffice. The first ribs are borne upon the second vertebra, 

 the so-called axis; they are rather short and distally expanded. 

 The fourth or fifth ribs, however, are slender, elongate gently 

 curved and not at all expanded distally. The second vertebra is 

 much shorter than the median dorsal ones, the third, fourth and 

 fifth increasing in length, until the full length is attained in the 

 sixth or seventh. The transverse processes are stout and long, 

 directed somewhat obliquely backward, the upper one, or diapophysisj 

 arising from the arch, the lower, or parapophysis, from the centrum. 

 The specimens figured (figs. 1, 4) are shorter and more transverse. 

 They do not seem to be mutilations, though such is possibly the 

 case. The arches have no real spines — merely a low obtuse ridge, 

 especially characterized by an oval or cordiform pit posteriorly; 

 that of the second vertebra is very large, while that of the third is 

 either small or wanting. The zygapophysial surfaces are broad 



