NERVOUS SYSTEM. VERTEBRATA. 323 



D. 421. The brain of a Bactrian Camel (Camelus bactrianus), 



This brain closely resembles that of the Arabian Camel. 



0. C. 1328 G a. 



D. 422. The cast of the cranial cavity of a Bactrian Camel 



( Camelus bactrianus) . 



D. 423. The brain of a Llama (Lama glama). 



A smaller, much simplified, Camel's brain. 0. C. 1328 H. 



Family TEAGULID^E. 



D. 424. The brain of a Chevrotain ( Tragulus sp.) . 



" The brain of Tragulus as far as its surface-marking is 

 concerned is a simplified miniature of the CervidsB" (Flower). 



There is an elongated, deep, suprasylvian sulcus. But 

 there does not appear to be any definite representative of a 

 pseudosylvian sulcus, although the shallow vertical furrow 

 [on the left side there are two furrows] below the supra- 

 sylvian sulcus may represent the " Sylvian fissure/' so-called. 



No coronal sulcus, such as Krueg describes (from Owen's 

 figures), is present in this specimen. Nor is there any 

 lateral sulcus, as Krueg represents ; but the suprasylvian 

 sulcus gives off a horizontal branch which may in a sense 

 serve the same purpose as the lateral sulcus. 



There is a short orbital sulcus placed very far forward in 

 the hemisphere. 



Perhaps the most peculiar feature of this brain is the 

 position of the sulcus which a comparison with the brains 

 of other Ungulates compels us to regard as the " splenial " 

 complex of calcarine and intercalary sulci. It is placed 

 almost wholly upon the dorsal surface arid only reaches the 

 mesial surface at its extreme anterior end. 0. C. 1328 F. 



Krueg, Zeitsch. f. wiss. Zool., Bd. xxxi. 1878, p. 315. 



D. 425. The brain of a Javanese Chevrotain ( Tragulus javamcus) . 

 This extremely simple and highly-macrosmatic brain is 

 of interest as exemplifying the primitive types which may 

 occur exhibiting distinctly-Ungulate characters. 



