151 



680. A portion of the upper jaw of a I'ara***, showing the long, compressed, pointed, 

 trenchant and recurved crowns of the anchyloaed teeth. //*/>///. 



OM. The lower jaw of a Monitor (t'arainu varifyatiu), showing the character* of 

 the pleurodont type of dentition ; the adhesion, namely, of the toeth by their 

 basis to an alveolar wall. The numbers on the bones indicate their names 

 according to the Table of SYNONYMS. ////,-', 



Order CROCODILIA. 



Genus Gavialit. 

 632. The skull of tin- (iavial, or more properly ' CJahrial ' (QaeiaKt yaagetiau). 



The characters of this grans of CrocoJUia are nuuiifMted not only by the long and slender 

 snout, but by the even line of the alveoli, and by the smaller, more numeroiu and equal-*izcd 

 terth, the crown* of which arc slightly compreMed from befurr backwards, and present a nharp 

 external and internal ridge: the first and third teeth are the largest in the up|xr jaw, the 

 first and fourth in the lower jaw. Both these teeth are received into notches in the harder 

 of the other jaw, and are visible when the month is shut. Tin- lrm|H>ntl apertures, bounded 

 by the united mastoids and postfrontals externally, are relatively larger than in the Croco- 

 diles or Alligators : the nasal bones terminate before they have attained half tin- length at 

 the upper jaw, and the external nostril is entirely surrounded by the premaxillary bones, 

 which are longer than usual, and terminate, in a point posteriori)'. There is no trace of vonier 

 upon the palate : each pterygoid expands into a Urge oval bulla at its external and anterior 

 pert ; the plane of the posterior nasal aperture is horizontal. 



More than half the length of the lower jaw is formed by the sym|>hyi*. The alveoli in 

 the premaxillary are ." 5, in the maxillary 21 2-J, in the dentary _'."> 25. 



llunterian. 



683. The atlas and axis of the Gavial (Gatialia gangi-liou). 



The hypapophysis, which represents the body of the atlas, is *ubi|uadratc, with the angles 

 truncated : the neurapophyse* articulate with the two upper angles, and the pleurapnphyies 

 with the two lower ones : the pleurapophyses arc long, slender, and with a single proximal arti- 

 culation answering to the bead of the rib. The anterior surface of the li\ |>ji|->|iliysi ia obliquely 

 excavated to form the lower half of the cup for the occipital condylr : the back part articulates 

 with the true centrum of the atlas (odontoid). The neurapophyiu**, which complete with the 

 hypapophysis and the end of the centrum the articular cavity for the ixvipital condyle, are 

 distinct above as well as below. The neural spine is not retained in this sjxrimeu, but u an 



