APTEEODON MACROGNATIIUS. 
229 
articular surfaces being oval iii outline. The dimensions (in centimetres) of this 
vertebra are : — 
Ijeiigtli from top of odontoid to posterior face of centrum . . 6-(5 
VVidtli of anterior articular surface of centrum 5 
,, posterior articular surface of centrum 2-‘J 
I leight to top of arch ti’Tapp. 
Width between outer ends of zygapophyses 4'7 
Text-fig. 74. 
Left humerus of (?) Apterodon macrognatlius : A, from front ; B, from outer side. 
h.g., bicipital groove ; d., deltoid crest ; en.f., entepicondylar foramen ; /«., head ; i.c., inner condyle; i.t., inner 
tuberosity ; o.c., outer condyle ; o.t., outer (greater) tuberosity ; s.r., supinator ridge. 4 nat. size. 
C. 9445. Left humerus (text-fig. 74). The head (/«.) 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 and the 
