342 PHYSIOLOGICAL SERIES. 



D. 493. The left half of the brain of a Sheep (Ovis aries). 



The appearance of the mesial sagittal section of the 

 cerebellum, the pattern of which is remarkably constant 

 throughout the Meta- and Eutheria, is clearly shown. 



O.C. 1327 A^. 

 W. Kuithan, Die Entwickl. des Kleinhirn. M unchen, 1.895. 



D. 494. The right cerebral hemisphere of a Sheep, dissected to 

 expose the hippocampus. 0. C. 1327 A h. 



D. 495. Part of the left half of the brain-stem of a Sheep (Ovit 

 aries). 



The large size of the anterior quadrigeminal bodies in 

 comparison with the posterior pair is shown. The tract us 

 peduncularis transversus can be very clearly seen as a 

 prominent strand crossing the inferior brachium from the 

 groove between the optic thalamusand the anterior quadri- 

 geminal bodies to reach the surface of the pes pedunculi. 

 The mesial geniculate body lies in front of the tract ; it is 

 flattened and unobtrusive. 0. C. 1327 A t. 



D. 496. The brain of an Anoa (Anoa depressicornis), ( $ ). 

 The simplest and most generalised Ox-brain. 



0. C. 1327 c MI. 



D. 497. The head of a foetal Ox (Bos taurus) with the dorsal 

 surface of the brain exposed in situ. 



The simple corono-suprasylvian and lateral are the only 

 sulci present on the dorsal surface, and the spleuial complex 

 can also be seen on the dorso-mesial edge. 



The corpora quadrigemina are not yet covered by tin 

 hemispheres. 0. C. 1328 A b. 



Krueg, Zeitsch. wiss. Zool., Bd. xxxi. 1878, p. 319. 



D. 498. The brain of an Ox (Bos taurus), from which the mem- 

 branes have been only partially removed. 



The brain of the Ox resembles that of the Sheep, but is 

 more richly supplied with sulci as a result of its greater 

 size. 



A very peculiar arrangement of the " Sylvian region " is 

 found in this specimen. 



