324 



Prof. G. Elliot Smith. 



[Jan. 15, 



olfactory stalk is an irregular rostrum with two small boss-like projec- 

 tions, one above the other (a and a'). The cerebral hemispheres in 

 the natural cast have a broad base, from which the sides extend up- 

 ward toward the narrow dorsal surface with a gradual slope. In the 

 artificial cast, however, the lateral parts of the hemispheres seem to 

 be expanded into full rounded swellings. 



Then, again, the antero-posterior diameter of the hemisphere is 

 much shorter (being about 13 mm. less) than it is in the natural cast, 

 although the breadth of the two specimens is approximately the same. 



It may be that the anterior parts of the skull, from which the artificial 

 east was made, are so damaged that little reliance can be placed upon 

 the mould as an indication of the exact form of the brain. In fact, if 

 this artificial cast even approximates to the form of the brain, it is 

 quite certain that it did not belong to the same genus as the animal 

 from which the natural cast was derived. 



In other words, as we know that the artificial cast belonged to 

 Zeuglodon, the probability is that the natural east furnishes the first 

 evidence of some hitherto undescribed genus of Archseoceti. 



Behind the -part b, which I have just described as the cerebrum, 



