90 



and deep. The splenial is long and stout, ends obtusely, and 

 does not reach the symphysis. The articular cavity is broad 

 from side to side, but rather shallow ; it is not divided into 

 two distinct facets as in the alligator. The post-glenoid 

 process is very stout; it projects but slightly upwards, less so 

 than in either crocodile or alligator. It has no median ridge 

 as in the former genus, and is tuberous at the end. 



The teeth are much like those of the upper jaw, but are 

 somewhat sharper and more conical ; they are not recurved, 

 and have no distinct constriction, as is found in most of the 

 recent species. There are about eighteen teeth to each 

 ramus; the first is large and sharp, and is followed by two small 

 ones and then by the canine. The remaining teeth do not 

 exhibit any great differences of size. 



Measurements. 



M. 



Length of rami (straight) -618 



Width of lower jaw outside of glenoid cavities -316 



Length of symphj^sis -no 



Width of jaw at second enlargement '057 



Depth at oval foramen '073 



Greatest width at symphysis -iio 



Space occupied by teeth -340 



Breadth of glenoid cavity -072 



Length of post-glenoid -065 



VertebrcB. 



Cervicals. — The centra are long and nearly cylindrical, ex- 

 panding slightly near the anterior face. The hypapophyses 

 are short and broad ; they project forwards, and are some- 

 what compressed. The vascular foramina correspond in size 

 and position to those of the alligator. The neural canal is 

 small and subcircular, having comparatively short but very 

 stout neurapophyses, which are perforated behind the dia- 

 pophyses. These are short and stout, and are developed 

 from the neurapophyses alone. The zygapophyses are long 

 and flat ; the anterior ones project almost vertically. The 

 neural spines are stout, and of greater antero-posterior ex- 

 tent than in the alligator. 



Dorsals. — A few of the anterior dorsals have strong hypa- 

 pophyses. The centra of all are long and stout. The neu- 



