CONTENTS OF A BONP] CAVE. 13 



bones referred to A. latidens, and I, therefore, am not sure to which species it 

 belongs. The exposed front face of the navicular bone is nearly twice as wide as 

 long, while that of the cctocuneiform is subquadrate. The tarsal facets of the 

 metatarsal bones are very oblique, indicating that the axes of the latter are directed 

 more anteriorly than that of the tarsus, causing a constant flexure of the foot. 

 The posterior angle of the second metatarsus is produced proximally behind the 

 mesocunciform, while that of the third metatarsal projects- behind the ectocunei- 

 form in an obtuse tuberosity. The shafts of the second, third, and fourth meta- 

 tarsals are proximally compressed, and medially depressed. The fourth metatar- 

 sal articulates with the cuboid proximal to the articulation of the second with the 

 ectocuneiform, a character to be seen in a less degree in the articulation of the 

 second metatarsal with the mesocuneiform. It, therefore, follows that the line of 

 tarsal junction of the mctatarsals is a convex semicircle. 



DIMENSIONS OF HIND FOOT. 



H. 

 f longest (oblique) .... .032 



Diameters of navicular \ *ntoropoBterior -024 



I transverse f front) . . . . .021 



* longitudinal (front). . . . .014 



f anteroposterior . . . .017 



of mesocuueiform < transverse .... .010 



(longitudinal . . . . .010 



i anteroposterior .... .020 



" of ectocuneiform < transverse .... .015 



( longitudinal .... .015 



Transverse diameter of I., II., and III. metatarsals . . . .037 



of II. metatarsals .... .011 



of III. " .... .011 



Length of metatarsal, No. I. . . . . . . .037 



No. II. . . . .043 



No. III. . . . ... .044 



The proximal portions of three scapulae accompanied the head of a humerus, 

 and the proximal halves of ulnae and radius of other adult individuals of the 

 smaller general proportions. These display well excavated supra- and infra-spinous 

 fossa?, the latter the most pronounced. The plate of the scapula expands rather 

 widely immediately beyond the short neck ; the glenoid cavity is a transverse oval, 

 narrowed and produced at the coracoid extremity. The head of the humerus 

 proper is subequal in its diameters. A section of the ulna just beyond the coro- 

 noid process presents five angles, one superior, one inferior, two interior, and one 

 exterior. The upper and lower interior planes thus formed are the narrowest; 

 the two superior and the exterior soon fuse into a convex face. The coronoid 

 humeral face is much narrower than the olecranon, whose rim extends downwards 

 on the inner side to the middle of the shaft. The olecranon is flat below, and as 

 deep as wide at the end. The head of the radius expands laterally from the neck. 

 Its articular face narrows outwards, being reduced by a bevel of the inner part of 

 the superior edge. Its face is a little concave, and is not sigmoid in section as in 

 some mammals. 



