PTEKODON AFRICANUS. 
223 
riio lollowing specimens are referred provisionally to this species : — 
C. 8898. Lelt linmerns, somewhat imperfect at proximal end (text-fig. 70). The head (/t.) is 
very strongly convex from before backwards, and less so transversely ; its surface looks 
nearly as much backwards as upwards. The outer tuberosity (o.t.) is massive and 
roughened, but it is broken away above, so that its height cannot be observed. The 
shaft is to some extent laterally compressed till just above the distal expansion. The 
Text-fig. 70. 
Left humerus of (?) Pterodon africanus: A, from front ; B, from outer side. 
d., deltoid crest ; en.f., entepicoudylar foramen ; h., head ; i.c., inner condyle ; o.c., outer condyle ; o.t., outer 
(greater) tuberosity ; s.jj., supratrochlear perforation ; s.r., supiuator ridge. | nat. size. 
deltoid crest {d.) is only moderately prominent, and extends down about two-thirds of 
the shaft. The supinator ridge (s.r.') is very slightly marked. The inner condyle (i.c.) 
is moderately prominent, and there is a large entepicondylar foramen (en.f.). Both 
the coronoid and olecranon fossae are large and communicate by a very large suj>ra- 
trochlear foramen (s.p.). The trochlear surface consists of an inner portion produced 
considerably downwards, a broadly rounded intercondylar ridge, and a narrower outer 
portion. The whole bone seems to resemble the humerus of the American species of 
