;88 



THE EXTINCT BATKACIIIA, REPTTLIA 



condyle-meeting facet., Leaving none whatever for union with the centrun 

 suppose that in that species these elements were barely in contact. 

 Pig. 40. 



I. therefore, 



1. Mosagaurus maximus, Cope. 

 ■2. " dekayi, Bronn. 



4. Liodon validus, Cope. 



5. Clidastes propython, Cope. 



One-third natural size, except Bg. 4 one-fourth ('.'), 

 and 5, one-half, a, anterior articular surface foroeoip. 

 condyle; h, neural arch; e, articular face Cor centrum. 



The giants of the order belong here, for 

 the M. missuriensis, M. maximus, and M. 

 eisanteus are among the most elongate of 

 animals. They are only exceeded by some 

 of the whales of the present day. Add to 

 this their slender proportions, with no doubt, 

 powers of swimming- in the ocean, running, 

 springing and climbing on land, and we have 

 a combination of characters more formidable 

 than those of the Cimoliasaurus, Elasmosau- 

 rus and Crocodiles of that age of great Rep- 

 tiles. 



The following synopsis presents tin; char- 

 acters of the species in brief: 



I. Vertebral centra, with subround articular 

 faces. 



"■ A short ridge on the outer posterior an- 

 gle of the os quadratum. 



S The anterior caudals with circular articular faces; 



Quadrate bone with large alar and large proximal external angular articular surface; 

 meatal knob rudimental; a strong median posterior ridge become a, process; a short, 

 strong distal external longitudinal angle; very large teeth; (! 17 — )18. M. maximus. 



Quadrate bone with small alar articular surface and large meatal knob; external 

 proximal angle large; median posterior ridge rudimental; mandibular teeth \"i : very 

 large. M - PBINOEPS. 



A? The anterior caudal vertebra- with subpentagonal articular faces; 



Quadrate bone with moderate alar and angular surfaces proximally; knob small, me- 

 dian posterior ridge rudimental; distal external longitudinal angle elongate; mandibular 

 teeth, fourteen; mamillaries, eleven; pterygoids eight, moderate; large. M. GIGANTEUS. 



Quadrate bone with small alar and large external angular proximal articular surface; 

 meatal knob large, median posterior ridge rudimental; exterior distal longitudinal angle 

 a raised acute ridge; no external alar ridges; premaxillary teeth, lour; pterygoids sub- 



equal, less than half as large as mandibulars; large 



M. DEKAYI. 



""- An elongate ridge; on the outer posterior angle of the os quadratum; 

 Quadrate hone with small alar and small external angular proximal articular face; 



