1884.J MR. W. F. R. WELDON ON CALLITHRIX GIGOT. 9 



is a small posteio-parietal fissure, and a superofrontal which is very 

 short. The occipital lobe exhibits traces of division into gyri. 



Fig. 4. 



Larynx of Callithrix gigot, $ . jr. from the E. side, x2. 



Fig. 6. 



cm 



a.l. 



Erain of Callithrix giyot, natural size. 

 Sy. Fissure of Sylyius ; j^P-, postero-parietal fissure; tt.;"., antero-temporal 

 fissure; a?i., angular gyrus ; c.w., calloso -marginal fissure ; c«., calcarine 

 fissure. 



On the inner surface the calloso-marginal and calcariue fissures 

 simple and well developed. 



are 



