234 



PHYSIOLOGICAL SERIES. 



great horizontal fissure (fig. Ill), which divides the lateral 

 wall into two approximately equal parts an upper one of 

 neopallium, and a lower composed of pyriform lol>e. tul>er- 

 culum olfactorium, and olfactory bulb. 



There is no trace of a " Sylvian fissure." There i> a 

 typical orbital (presylvian) sulcus ($) which links the 

 cephalic prolongation of the posterior rhinal fissure to the 

 anterior extremity of the great sagittal lateral ^ulens 

 (figs. 110, 111, & 113, 7), and from the junction the 

 prorean sulcus extends forwards. 



Fig. 111. (X $.) 



~ 6 



RHIN.F. / 



OLF. PEO 



OLf. BULB. 



OLF. TUBER 



Fig. 112. 



CER. 

 PRIN.F. ! FLOC.F. 



/ PARAFLOC.D 



CORP;PUAD 

 OPT.THAL. j 



MED DDL. 



OPT TR. | 

 CORP SEN. ANT 



PARAFLOC.V. 

 ''FLOC 



CORP. BEN. POST. \ PONS. 



AREATEtGMCN 



There is a short hoi i/ontal .sulcus (8) in the situation 

 \\IMTC \\c -hould look for the supra-vlvian sulcus. Thi- 

 peculiar insignificance of the supra-vlvian a- 

 with the lateral sulcus, which is also seen in 

 many Rodents, presents a marked contrast to the Ungnl.it.- 

 condition, where i just the opposite condition oht:iin-. 



On tho inc-ial \\all there is a large arenate 

 (fig. 114, a) of df-ep calcarine. intercalarv, and o-onnal -ul 



