Squamafa — Pythonomorpha. 



27 



sivalensis from the Siwalik Hills of India. Fragments of jaws, 

 vertebra;, etc., referred to Varanus henjalensis, from caves, Kar- 

 nul. Madras, are preserved in the collection. Similar specimens 

 have been described by Mr. Lydekker {see Palseontologialndica). 

 From the Chalk of Sussex and Kent have been obtained 

 several examples of the snake-like lizard Dolichosaurus longicoUis, 

 and an allied genvis Aigialosatinis is represented in the collection 

 by a fine specimen of a nearly complete skeleton from the Cre- 

 taceous of the Island of Lesina, Dalmatia. 



Dolicliosau- 

 rus. 



Sob-order 3. — Pythonomorplia. 



The Mosasauridce were carnivorous marine reptiles, fre- Wall-case, 

 quently of great size, and ranging in time from the Upper ^°- '^' 

 Greensand to the uppermost Cretaceous beds, and having a 



I t 



Fig. 33. — Right pectoral limb of a Mosasauroid reptile, Platecarpus, sp. 



Cretaceous strata of North America. ^V nat. size (after Marsh.) 



a, scapula; 6, coracoid; c, humerus; d, radius ; and e, ulna. 



world-wide distribution. The body was much elongated ; the 

 skull offers a strong resemblance to the Varanidce amongst the 

 lizards, and has the nasal and premaxillae welded together ; the 

 quadrates very loosely articulated ; teeth on the pterygoids as 

 well as in the jaws, and frequently ossifications in the sclerotic 

 of the eye. The teeth are large and sharp, and anchylosed by 

 expanded bases to the summits of the jaws. The clavicles are 

 always, and the iuterclavicles and sacrum generally, wanting. 



