MONOGRAPH 



ON 



THE FOSSIL REPTILIA 



OF THE 



WEALDEN FORMATIONS. 



Order— DINOSA URIA. 



Genus — Megalosaurus,* BucMand. 



Dentes laniarii, subcompressi, marginibm minute serratis. 



The order or group of Dinosaurian Reptiles, briefly characterised in a preceding 

 Monograph, f includes at least three well-established genera, resembling each other in 

 having a large and complex sacrum, composed of five or more anchylosed vertebrae ; 

 in the height, breadth, and outward sculpturing of the neural arch of the dorsal 

 vertebrae ; in the twofold articulation of the ribs, or some of the anterior moveable 

 ribs, to the vertebrae ; and in having broad, and sometimes complex coracoids, and long 

 and slender clavicles; whereby a Lacertian type of the pectoral arch is combined 

 with a crocodilian type of the true vertebrae, and both with an ornithic type of 

 sacrum. 



These remarkable extinct Dinosaurs were of large, if not gigantic, size ; with the 

 trunk lifted, higher than in other reptiles, upon four unusually developed limbs ; the 

 principal bones of which are remarkable for the prominence and number of the 

 apophyses relating to muscular attachments, for the size of the medullary cavity, and 

 for the density of its compact bony wall : the limbs are terminated by metacarpal or 

 metatarsal, and by phalangeal bones, which, with the exception of the ungual phalanges, 



* Mr/os, great, oavpos, lizard. f 'Palseontographical Society,' vol. 185.3. 



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