APTIORODON MACIIOGNATIIUS. 
229 
articular surfaces being oval in outline. The diinensions (in centimetres) of this 
vertcbi'a are : — 
Length from top of odontoid to posterior face of centrum . . 6-6 
Width of anterior articular surface of centrum o 
„ posterior articular surface of centrum 2-{) 
Height to top of arch t)-7app. 
Width between outer ends of zygapoph.yses 4-7 
Text-fig. 74. 
Left humerus of (?) Apterodon macrojnathus : A, from front; B, from outer side. 
t.i;., bicipital groove ; cZ., deltoid crest ; en./., entepicondylar foramen ; A., head ; f.c., inner condyle ; t.<., inner 
tuberosity; o.c., outer condyle ; o.t., outer (greater) tuberosity; s.r., supinator ridge. | nat. size. 
C. 9445. Left humerus (text-fig. 74). The head (A.) is strongly convex and greatly elongated from 
before backwards; it looks as much backwards as upwards, while from side to side it is 
narrow and not very strongly convex. The outer tuberosity {o.t.) is high and somewhat 
compressed, its outer face is flattened, the inner concave. The inner tuberosity (i.t.) 
is a massive prominence with a flattened end ; between it and the outer tuberosity is 
a deep bicipital groove (b.g.). The shaft is very strongly compressed laterally aiul the 
