324 PHYSIOLOGICAL SERIES. 



There appears to be a definite coronal sulcus quite 

 distinct from the suprasylvian. 



The posterior horizontal branch of the suprasylvian 

 sulcus is seen to better advantage in this than in the last 

 specimen. 



In this brain, and more especially on the right side, 

 there seems to be a definite representative of the Ungulate 

 " Sylvian fissure/' 0. C. 11528 F a. 



Presented by J. Abrahams, Esq. 



D. 426. A cast of the cranial cavity of a Stanley's Chevrotain 

 ( Tragulus stanleyanus) . 



This shows the true size and shape of the olfactory bulbs. 

 It also shows that as regards the suprasylvian sulcus and 

 its horizontal branch this Chevrotain closely agrees with 

 the Javan representative. 



Gervais, Journal de Zoologie, t. i. 1872, p. 460. 



D. 427. The brain of an African Water-Chevrotain (DorcatJicr/um 

 aguaticum), ( ? ). 



This brain presents a very close resemblance to that of 

 the Chevrotain both as regards its general features and 

 shape and also in respect of the suprasylvian and " splenial " 

 sulci. The orbital sulcus, however, is more pronounced 

 and approaches very close to the suprasylviau sulcus. 



There is a definite short "Sylvian fissure" ascending 

 from the rhinal fissure toward the supnisvlvian snleus. 



0. C. 1328 K ft. 



D. 428. The brain of an African Water-Chevrotain, divided \>\ 

 mesial sagittal section, and with the right cerebral hemisphere 

 separated from the brain- stem. 



This is an excellent example of the simplest type <>t 

 Ungulate brain. It clearly exhibits the charade; 

 relationship of the Ungulate pseudosylvian sulcus to the 

 rhinal fissure and to the orbital sulcus. It can now le elearly 

 seen that the pseudosylvian sulcus does not really join the 

 rhinal fissure and is therefore not identical with the Carni- 

 vore pseudosylvian sulcus. There is no lateral >nleii>, and 

 the intercalary and suprasylvian sulci occupy their distinc- 

 tively Ungulate positions on the dorsal surface of the 

 hemisphere. 





