CONDYLARTHRA. 401 



M. 



Anteroposterior width of head of fourth metatarsal 0135 



Width of first metatarsal at middle 007 



Length of cuboid in front 019 



Width of cuboid in front 0165 



Diameters distal facet l«'^^«^°P°«t«"'"" "^^ 



( transverse 014 



No. 4 (large form). 



Diameter shaft humerus at middle 016 



Depth head of radius 013 



Width calcaneum at sustentaculum 026 



Width navicular 018 



Length navicular 007 



Length ectocuneiform 012 



Width ectocuneiform 009 



Depth ectocuneiform 019 



Length of a short metatarsal (? iv) 030 



Depth of the same metatarsal proximally 015 



Width of the same metatarsal dislally 012 



Length of phalange of M. i or ii 019 



Width of phalange distally 008 



Length phalangine of M. i or ii Oil 



AVidth proximally 009 



Width distally - 007 



Length astragalus of a second specimen -. 027 



Width of trochlea 019 



Elevation externally 013 



Brain. — The cast of the middle part of the brain-case ah-eady men- 

 tioned (p. 388) presents interesting characters. The cerebral hemispheres 

 are very flat, and are only differentiated from the olfactory lobes by a mod- 

 erate contraction and depression, which forms the peduncle of the latter. 

 Only the proximal part of the olfactory lobe is preserved, but this expands 

 so as to be only a little narrower than the hemispheres. The peduncle has 

 a ridge on the median line, and a shallow fossa on each side of it. The lat- 

 eral outlines of the hemispheres diverge, and the widest part is posterior. 

 There is no indication of sylvian fissure. The transverse section of the 

 hemispheres would be a flat arch but for the presence of a longitudinal 

 oval protuberance on each of them, which do not quite touch the median 

 line, and which have definite boundaries. If their limits determine the size 

 of the cerebral hemispheres, then the latter are wider than long, but they 

 probably pass gradually into the mesencephalon behind them. These 

 bodies remind one of the corpora olivseformia, and may i-epresent the supe- 

 rior or median frontal convolutions. They are probably, however, not to 

 26 c 



