350 SCOTT. [Vol. V. 



III. The Brain. 



The museum of the Academy of Natural Sciences in Phila- 

 delphia contains a brain-cast which appears to belong to Lepto- 

 meryx, although it is smaller than the skull figured by Leidy 

 (No. 33, PI. XIV.). In shape and in the character of the 

 convolutions this specimen is very like the intracranial cast of 

 Tragidus figured by Milne-Edwards (No. u, PL VI., Fig. 2). 

 The olfactory lobes are decidedly larger than in the modern 

 form, the hemispheres narrower, and the cerebellum and cere- 

 brum not in contact, so that the corpora quadrigemina were 

 probably partly uncovered. The hemispheres are very narrow 

 anteriorly ; the constriction is more sudden than in Tragidus 

 and the portion in front of it much smaller. The splenial fissure 

 does not appear to show upon the dorsal surface, as it does in 

 the chevrotains and the small deer, though this is not quite cer- 

 tain. The lateral fissure is longer and better marked than in 

 Tragidus ; the suprasylvian fissure follows very much the same 

 course as in that genus, but the coronal sulcus, with which it is 

 continuous, is more oblique and approaches nearer to the median 

 line. The occipital lobes are broad and the temporo-sphenoidal 

 lobes deep. 



The cerebellum is large, with very prominent and convoluted 

 vermis ; the posterior surface of the latter is strongly projecting, 

 is vertically placed, and forms nearly a right angle with the 

 dorsal surface. The top of the cerebellum is nearly in the same 

 plane as the top of the cerebrum, agreeing in this respect with 

 Cainotherium rather than with Tragidus. The lateral lobes of 

 the cerebellum are apparently smooth and the flocculi are small. 

 The medulla oblongata is very thick. 



IV. The Vertebr/e. 



Of the spinal column we have preserved the neck and first 

 two dorsal vertebrae of one specimen, and several scattered 

 dorsal and lumbar vertebral centra of other individuals. The 

 cervicals are very much indeed like those of Tragidus. The atlas 

 is short and broad, with transverse processes of only moderate 

 extent, very different from those of the Pecora. The axis has 



