TERTIAHT VERTEBKATA OF THE FATfJM. 
rioO 
deltoid crest (d.) is enormously developed, forming tlie strongly convex sharp anterior 
edge of threc-rourllis of the length of the shaft. The supinator ridge (s.r.) is greatly 
developed as a sort of scroll-like flange which projects very strongly ])ackvvards 
as well as outwards. The inner condyle {i.c.) is very prominent, and there is an 
ente{)icondylar foramen {en.f.). The coronoid fossa is small and shallow; the olecranon 
I'ossa is also small, hut sharply defined ; there is no suf)ratrochlear perforation. The 
distal articulation consists of a prominent inner portion, projecting below the rest of 
the surface, a gently rounded intercondylar ridge, and a narrow outer surface deeply 
notched distally as in Lufra. On the whole, this humerus is \ erylike that of Lutra and 
Text-fig. 75. 
A. B 
Itight tibia of (?) Apterodon macrognatlnis, lacking epiphyses: A, from inner side; E, from front. 
cn.. cnemial crest ; ?»(., ao', deep impressions for muscle-attachments, j nal. size. 
still more like that of Poiamoihn 'imn, so that it is ]) 0 ssihle that the animal to which it 
belonged may have lived a semi-a(piatic lile. The dimensions (in centimetres) ol this 
sp(*cimen are : — 
Length (from toj) of great trochanter) -1 
Width of proximal end 5-8 
„ middle of shaft (from side to side) Id! 
,. „ ,, (from before backwards) .... 8\S 
.. distal end ba} 
,. „ articulation 
M. 9257. 1 Taster cast of the above specimen. 
Mtule in the lintifli Mnseum. 
