50 The Alligator and Its Allies 



are near the hinder border of the scales. Only 

 occasionally are two pits 

 found in one scale. These 

 pits are found in the gav- 

 ials but are absent in 

 some, probably all, alli- 

 gators. A small knob 

 projects from the cen- 

 ter of some of the pits. 

 These pits are not open- 

 ings of glands but have 

 about the same structure 

 as the pits seen in the 

 head. 



The integumental 

 bones in the Crocodilia 

 originate in the connec- 

 tive tissue of the cutis. 

 Investigations in young 

 animals show that these 

 bones usually take their 

 origin in the under and 

 middle layers of the 

 cutis and generally work 

 towards the periphery. 



B. THE ENDOSKELETON 



/. 7"/z^ Vertebral Column. 

 The vertebral column 

 consists of about sixty- 



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