SHEEP'S BRAIN WITHOUT CORPUS CALLOSUM 265 



A SHEEP'S BRAIN WITHOUT A CORPUS CALLOSUM. 



H. A. SCULLEN. 



The brain in question was one from a shipment of dissecting 

 material purchased from the Western Biological Supply Com- 

 pany of Omaha, Nebraska. 



It will be seen from the illustration that the entire Corpus 

 callosum and the posterior two-thirds of the Fornix are lack- 

 ing. Lying between the membranes which form the only 

 wall between the Diacoele and the Paracoele may be seen a 

 slender cord of alba nearly round and about one-fourth of a 

 millimeter in diameter. The connection of this cord seems to 

 be such that it should be considered Fornix and not Corpus 

 callosum. The remaining commissures and all other parts of 

 the brain seem to be normal. 



The author has had occasion to examine between two and 

 three hundred sheep brains in the past four years and to date 

 no other abnormality has been noted. So far as is known no 

 other similar abnormality has been reported. 



Department of Zoology, 

 Iowa State College. 



