212 PHYSIOLOGICAL SERIES. 



is shorter. There is no pallial sulcus on the mesial surface of 

 the left hemisphere, hut a faintly marked furrow is present 

 above the corpus callosum in the right side. 0. C. 1323 I b. 

 Elliot Smith, Trans. Linn. Soc. loc. cit. 



D. 270. The brains of two Pebas (Tatu novemcincta) . 



In most of their features these brains closely resemble 

 that of Cabassous. 



Fig. 86. (Nat. size.) 



The posterior rhinal fissure is very small and ihcanferior 

 rhinal is also very short. There is a well-defined jm '-Vivian 

 09) but no suprasylvian sulcus. 



The most noteworthy feature is the large size of the corpus 

 callosum in comparison with that of other Armadillos. 



0. C. 1323 ic. 



Elliot Smith, Trans. Linn. Soc. loc. cit. 



Family OLYPTODONTID^:. 



D. 271. A cast of the cranial cavity of Glt/j>f<xlo/i danceps. 



This is a replica of Gervais's model. It shows tin- 

 extraordinarily small size of the brain in compari-oii with 

 that of the body of the animal ; the enormous dimension- 

 of the large, pedunculate! 1 and projecting olfactory bnll : 

 tin- diminutive size of the cerebral hemispheres ; and the 

 extraordinary greatness (especially in breadth) of the 



helium. 



The cerebral hemispheres are flattened, and the only trace 

 of a -ulcus i< one in the " Sylvian i'<'i:ion," which probably 

 represents the BO-called supnisylvian sulcus of the Arma- 

 dillos, unless, after the analogy of GaleopitJuciu and many 

 Eocene Mammals, it is a phenomenally hi^h rhinal lis.-nre. 



Gervais, Nouv.'Arch. Mus., t. v. 1869, p. 42. 



