I'.'l PHYSlnL.M.K AL SKIS IKS. 



slightly upturned anterior extremity overlaps the posterior 

 extremity of a sulcus curiously like the rostral sulcti- of 

 ihe Sloths (fig. G9). 



The peculiarly-sinuous rhinal fissure is placed high up 

 on the lateral wall of the hemisphere. Its posterior ex- 

 tremity rises to a much higher level than any other p irt of 

 the fissure (fig. 68), as often happens also in the Eocene 

 Mammalia. 



In the small neopallium we find short sulci corresponding 

 to the orbital (presylvian) suleus (x), and the so-called 

 44 Sylvian fissure " (y) of such mammals as the Three-toed 

 Sloth and many Carnivores. 



Midway between these sulci and the interhemisphera] 

 cleft there is a longitudinal suleus almost as long as the 

 hemifpherej presenting a slight concavity toward the 

 mesial plane (fig. 67, w). There is nothing to help us to 

 decide whether it represents either the unprasylvian or the 

 lateral suleus, unless it be the fact that the former is the 

 more primitive and stable of the two sulci in mammals 

 generally. But its resemblance to the conjoint suprasylvian 

 and coronal smci in such small Ungulates as Dorcatherium 

 and Trctf/ulus seems to be more than a fortuitous likeness. 



The cerebellum is unusually small and presents all the 

 primitive simplicity of the Insectivore organ. [The 

 illy-projecting floccular lobes have become knocked off 

 in this specimen.] 



The anterior quadrigeminal bodies are extremely large 

 and bulge upward between the cerebellum and the cerebral 

 hemispheres. The posterior quadrigeminal bodies and the 

 medial geniculate bodies are of moderate dimensions. 



It is of interest to note that the tractus peduncular!* 

 trans versus which is feebly developed or perhaps absent in 

 Marsupial- and certain of the Insectivora and Edentata, is 

 welUdeveloped in Galeopitliecus. 



Presented /<// I'rof. G. Elliot Smith *. 



W. Leche, Kon-1. Sv, Vet.-Akad, Handl., lid. xxi. II 

 p. 48. 



* This is one of aeveral specimens which had been extracted and care- 

 fully preserved by Dr. Charles Hose, of Borneo, and generously given to the 

 for examination. 



