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parietal bones, and the plates of the internal pterygoidal 

 apothysis. 



The jugal bone joins, anteriorly, the posterior apothysis 

 of the maxillary bone, passes under the orbit, and terminates 

 behind in a point which forms the outer margin of the con- 

 dyloidal apothysis or prominence of the skull. 



The space which is commonly filled by one or two 

 frontal bones is, in this genus, occupied by five distinct 

 bones ; a middle one, between the eyes, which articulates 

 with the hinder part of the nasal bones, and is notched at 

 its sides by the orbits, and forwarder by two other bones, 

 supposed, by Geoffroy, to belong to the ethmoidal bone, 

 and which form, by vertical apothyses, part of the orbital 

 margin ; the two other bones, decidedly parts of the frontal, 

 yield apothyses which correspond to the post-orbital apo- 

 thyses of the frontal bone, and, with that of the jugal 

 bone, fill up the back part of the orbital frame, as in the 

 ruminants. 



The lower jaw is formed by six bones. The dental, in 

 which are the sockets of the teeth ; these bones unite in 

 front, and form the anterior angle of the jaw. The oper- 

 cular, which covers all the inner surface of the jaw, ex- 

 cepting at the fore part, which is formed by the dental 

 alone. The coronoidal and angular, the former the upper- 

 most, receive in their fore part the end of the dental, leav- 

 ing between them a large oval opening. The angular bone 

 turns upwards so as to fill a space on the inner surface of the 

 jaw. Between this and the opercular bone is another oval, 

 but smaller opening ; and, beneath that, a considerable va- 

 cuity, as the coronoidal does not turn over on to the inside ; 

 the anterior point of this vacancy is bordered by a small 

 crescent-formed bone. The condyle is formed by one par- 

 ticular bone, named the articular bone. The coronoidal has 

 not, in the crocodile, any apothysis, as is the case in other 

 reptiles. 



