CENTRAL NERVOUS SYSTEM OF ARMADILLO. 295 



Smith's (1899) work on the Armadillos is by far the most 

 important, and for this reason I have compared the species under 

 present consideration with his descriptions. 



The brain of Tatu novemcinctum shows less similarity with the 

 genus Chlamydophorus, than with the brain of any other genus 

 of armadillo. To judge by the figure of Xenurns unicinctus 

 given by Garrod (1878), there seems to be greater similarity of 

 the brain of Tatu with Xcnnms than with any other genus of 

 armadillo. The fissures, sulci, and the general shape and con- 

 tour of these two brains have very many points in common. 

 However, much more detailed study must be made of all the 

 species of Armadillo before one could venture to assert this with 

 any degree of certainty. 



