NEliVOUS SYSTEM. VERTEBHATA. 



205 



rhinal fissures. It probably represents a fusion of the 

 so-called " Sylvian fissure " of most non-Primate orders 

 and the suprasylvian sulcus. Such a fusion is found in the 

 Great Anteater's brain (vide infra) and also, in all 

 probability, in the Primates, in which the complex forms 

 the true Sylvian fissure. In this brain, so as to avoid 

 confusion, we may call it the " Sylvio-suprasylvian 

 complex/' 



Fig, 74. (x3.) 



,.,SULC.COR.LAT. 



There is a small horizontal presylvian (or orbital) sulcus, 

 which is not joined to the rhinal fissure. 



There is also a short sulcus of doubtful significance on 

 the external side of the caudal end of the lateral sulcus 

 (figs. 74 & 75). 



Fig. 75. (x.) 



SULC.ORB. 



The resemblance between the cerebral sulci of this brain 

 and those of the Lemurs is very instructive (vide infra). 



There is a compact cerebellum, which is relatively larger 

 and broader than that of the Capybara. It also conforms 

 to a more generalized type found in many other Rodents, 

 Edentates, Insectivores, and Marsupials. 



The floccular lobes project like those of the Ilabbit. 



O.C. 1323 Ef. 



Beddard, Proc. Zool. Soc. 1802, p. 008. 



