TRANS. AM. PHILOS. SOC, N. S. XXI. 



PLATE XV. 



Kii;. 11. 1. liniin <if Ilelnilidltz (iiflt-r plioto of cast by llniif-t/iiianii). 2. Bniin (if I'apiiaii fruiu 

 British New (luinea; specimen in Anatomical Laiioratory at C'olmiibia l'ni\'ersity, iSew York. 

 3. Brain of Gorilla (D. 6-')8, Mus. Koy. Coll. Surgeons of England). 



