17 / 



1885.1 Li |Cope. 



Measurements of Ramus and Teeth. M. 



Diameters of base of seventh J anteroposterior Oil 



tooth from end ( transverse 0085 



Length of crown of a loose tooth (same animal) 0225 



Diameters middle crown of a J anteroposterior 080 



loose tooth ( transverse ~. . . .050 



From these measurements it is evident that the anterior extremity of 

 the lower jaw is not expanded. The teeth of the anterior pair are directed 

 rather more anteriorly than exteriorly. At the symphysis a horizontal 

 figure oo shaped fossa marks the junction of the splenial and dentary 

 bones, and the inferior side of the former is grooved on the middle line tor 

 15 mm. in front of the symphysis. 



The malar bone is elongate and strongly compressed, showing the great 

 obliquity of the os quadratum. It sends upwards a postorbital branch, 

 which is external as in other Teleosauridae, and not internal as in Croco- 

 dilidse. The surface is marked with shallow longitudinal fossae like those 

 of the lower jaw. Length from postorbital branch to quadratojugal, 

 upper edge, .120 ; lower edge, .165; depth at middle, .024; thickness, .010. 



In the most anterior dorsal preserved, the diapophyses are entirely on 

 the neurapophyses. The articular faces of the centrum are shallowly 

 concave, and the sides between them are flattened but not very concave. 

 The hypapophysis has a long compressed base, which ceases 10 mm. an- 

 terior to the posterior extremity of the centrum. The neurapophysial 

 suture is very little decurved in the middle. The diapophysis displays a 

 capitular articular process, with small facet, which originates just above 

 the suture with the centrum. The tubercular facet is at the extremity of 

 a robust process, whose posterior edge originates near the posterior edge 

 of the neurapophysis, and is wide at the base, enclosing a fossa. A sec- 

 tion of the base of the diapophysis is subquadrate, with the superior or 

 anterior angle rounded, and the inferior anterior produced downwards 

 and forwards for the base of the capitular portion, like the tail of a comma. 

 The general form of the tubercular part of the diapophysis is subcorneal. 

 A convexity proceeds from its anterior base, its continuation forming the 

 lateral convex face of the prezygapophysis. The latter is small, and its 

 superior or articular face is on a level with the roof of the neural arch, 

 thus having a rather low position. The arch rises steeply to the neural 

 spine. The latter is moderately elevated, and is much compressed and 

 thin, having a narrow anterior edge, and a posterior edge not quite so nar- 

 row. The summit is not thickened, as is the case in Teleosaurus cadomen- 

 sis, according to Deslongchamps, and is wide anteroposteriorly. Both 

 anterior and posterior edges of the spine are a little thickened, and are 

 medially grooved for a short distance above the neural canal. The neural 

 canal is ample, and is a little wider than high at its anterior extremity. 



In a dorsal vertebra near that last described in the series, the capitular 

 part of the diapophysis is carried nearer to the tubercular portion, and 

 the base of the two combined is less robust, the section having an elon- 



PROC. AMKR. PHILOS. SOC. XXIII. 121. C. PRINTED OCTOBER 10, 1885. 



