CLASS REPTILIA. 



II. The head oblong ; canine teeth of the lower Jaw received 

 in a notch in the edge of the upper ; feet palmated. 

 Crocodilus. 



Common Crocodile. Crocodilus Vulgaris , Ann. Mus. x. 



t. 3. 

 The head equal, broad ; nuchal plates six ; cervical six, sub- 

 equal ; the dorsal shields quadrate, six rowed, Africa and 

 India. 



RuppelVs Crocodile. Croc. Octophractus, Ruppell, MSS. 



The head equal, lon^- ; nuchal plates four, cervical eight, 

 unequal ; the dorsal shields slightly keeled. Africa, Don- 

 gola, and Senegal. 



Double-crested or Indian Crocodile. -Crocodilus Bipurcatus, 



Cuv. 



The forehead with two nearly parallel longitudinal ridges ; 

 nuchal shields six ; dorsal sliields ovate, eight rowed. India 

 and its islands. 



Rhombic Crocodile. Crocodilus Rhombifer^ Cuv. 



The forehead convex, with two diverging ridges; nuchal 

 shields six ; dorsal scales quadrate, six rowed ; scales of the 

 limbs thick, keeled. 



Siam. Crocodile. Crocodilus Galeatus, Cuv. Hist. Anim. 



Par. 6, a. 



Crown of the head with a two-toothed elevated crest ; nuchal 

 shields six. India. Siam. 



Two-shielded Crocodile. Crocodilus Biscutatns, Cuv. 



Nuchal shields two ; the middle dorsal scales quadrate, 

 the outer irregular, scattered. 



West Indian Crocodile. Crocodilus Acutus, Cuv. Geoff. 

 Ann. Mus. Par. II. t. SJ. 



Head produced, convex at the base; middle dorsal scales 

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