NERVOUS SYSTEM. VERTEBRATA. 



213 



D. 272. A cast of the cranial cavity of Glyptodon claviceps (two 

 specimens). 



This is a less perfect cast of a larger brain than D. 271. 



Family BRADYPODW^E. 



D. 273. The brain of a Three-toed Sloth (Bradypus tridactylus). 



[This specimen, having been preserved in situ in the 

 cranium, exactly retains its normal shape, but is unfortu- 

 nately too soft to permit the arachnoid and pia membranes 

 to be removed. The latter, however, are sufficiently thin 

 to permit the sulci to be distinctly seen.] 



Fi^. 87. (Nat. si/e.) 



r 



OJ-F..JUBER 



Fig. 88. (Nat. size.) 



The contrast between this brain and that of an Armadillo 

 is almost as pronounced as are the differences exhibited in 

 a comparison of the brains of the Cat and the Hedgehog. 

 The contrast between the habits of the fossorial, terrestrial 



