SYNOPSIS OF THE VKKTEBKATE FAUNA OE THE PUEECO SERIES. 331 



cies, but is smaller than the penultimate, and has but a short heel. The first pre- 

 molar is about the length of the first true molar. It is robust, and the cusp is a little 

 compressed, but is flattened behind. The heel is very short and is convex posteriorly. 

 A very small antciior basal cusp. The anterior part of the crown of the m. i 

 is higher than the posterior, which only supports one tubercle, the external. The in- 

 equality between the anterior and posterior tubercles of the third true molar is 

 unnoticeable. Ko cingula on molars or premolars. 



There are two lumbar and one caudal vertebra}. The centra ai'c depressed by 

 pressure ; arches lost. The caudal vertebra is one of the proximals. It is robust, and 

 indicates a well-developed tail. The head of the humerus is extended in the direc- 

 tion of the greater tuberosity. The latter is large and truncate both proximally and 

 externally ; at the posterior external angle is a distinct fossa m. teretis. The bici- 

 pital groove is wide. The lesser tuberosity is bounded by an angle, which rises prox- 

 imad and towards the greater tuberosity. The deltoid ridge extends to below the 

 middle of the shaft. The internal condyle is large and compressed so as to be verti- 

 cal ; it is pierced vertico-obliquely by the large entepicondyUu- canal. The external 

 epicondyle is very little jjrominent, and is mostly occupied by its fossa. The trans- 

 verse extent of the condyles is not very great. The lateral borders of its posterior 

 groove are sharp. The convexity of the roller is pronounced but not approaching an 

 intertrochlear crest. The distal extremity of the radius is wider than deep and the 

 outer side is truncate, so that the section of the shaft is a triangle. At the extremity 

 the ulnar side is grooved, and above the prominent superior border of this groove is 

 another, which is bounded above by a short robust Hat ridge. The outlines of the 

 scaphoid and lunar fossae are distinct except where they pass into each other. 



The ilium is robust, and at the peduncle the anterior or inferior face is nearly as 

 wide as the interior. At the sacral articulation it is moderately expanded. The an- 

 terior inferior s[)ine or tuberosity is moderately prominent, and is situateil a consid- 

 erable distance proximad of the acetabulum, opposite the narrowest part of the 

 peduncle. 



Measurement'. M- 



Length m. i 009 



Width " posteriorly OOO.'i 



{antero])oslerior 000 

 AA-r 

 transverse 0()i.> 



f iinteropostcrior 000 



Diameters m. iii -! 



h 



riinsverse . 



.007 



f anteroposterior 009 



i^fiamciers p. m. i { „nr 



I transverse ""■' 



Length of centrum of lambar vertebra 022 



