MORPHOLOGY OF THE CEREBRAL CONVOLUTIONS. 363 



EXPLANATION OF PLATES. 



Plate XXXIV. 



Fig. 1. Fissures, 2, F. Sylvii; 3, occipitalis; 6, Rolando; 7, parietalis; 8, prcecentralis; 9, 

 froD talis sup. ; 10, frontalis inf. ; 11, temporalis sup.; 12, temporalis med. ; 17, occipitalis trans.; 19, 

 occipitalis longitud. inf. Gyres, I, G. frontalis sup.; II, frontalis medius; III, frontalis inf.; IV, 

 Rolandicus ant. ; V, Rolandicus post. ; VI, parietalis sup. ; VII, parietalis inf. ; VIII, temporalis sup. ; 

 IX, temporalis med.; X, temporalis inf., a, operculum; b, supra-marginalis; c, angularis; d, occipitalis 

 primus; e, occipitalis secundus; /, occipitalis tertius. 



Fig. 2. Fissures, 3, F. occipitalis; 4, calcarina; 5, hippocampi; 6, Rolando; 14, collaterals ; 16, 

 calloso-marginalis; Col. callosalis. Gyres, XI, G. marginalis; XII, fornicatus; XIII, cuneus; g, 

 uncinatus; A, dentatus; j, paracentral; k, praecuneus; I, descendens. 



Fig. 3. Fissures, 4, F. calarina; 3, occipitalis; 12, temporalis media; 13, temporalis inf.; 14, 

 collateralis ; 15, olfactoria; 18, orbitalis. Gyres, XII, G. fornicatus; XIII, cuneus; XIV, occipito- 

 temporalis medialis; XV, occipito- temporalis lateralis; X and IX, temporalis medius et inferior; m, 

 rectus; n, orbitalis medius; o, orbitalis lateralis. (Figs. 1, 2, 3 are from Clevenger, Ecker.) 



Figs. 4 and 5. Brain of Macacus nemestrinus. 



Figs. 6, 7, 8, 9, 10. Brain of Indris (from Milne Edwards et Grandidier's Hist, de Madagas- 

 car, 1875). 



Fig. 11. Brain of Midas (from Owen). 



Figs. 12, 13. Brain of Hapale (from Flower, Phil. Trans., Vol. 152, 1862). 



Figs. 14, 15. Brain of Propithecus Edwardsii (from Milne Edwards et Grandidier, loc. cit.) 



Figs. 16, 17. Brain of Lemur nigrifrons (from Flower, Phil. Trans., Vol. 152, 1862). 



Figs. 18, 19, 20. Brain of Avalis (from Milne Edwai-ds et Grandidier, loc. cit.). 



Figs. 21, 22, 23. Brain of Propithecus diadem a (from Milne Edwards et Grandidier, loc. cit.). 



Fig. 24. Brain of Aye Aye (from Owen). 



Fig. 25. Brain of Gibbon (from Owen). 



Fig. 26. Brain of Callithrix (from Owen.) 



Figs. 27, 28. Brain of foetal Cebus apella (from Ecker). 



Plate XXXV. 



Figs. 1, 2. Human foetal brain at three months. 



Figs. 3, 4. Human foetal brain at three and a half months. 



Figs. 5, 6. Human foetal brain at five months. 



Fig. 7. Human foetal brain at five and a half months. 



Figs. 8 and 9. Human foetal brain at six months (from Bischoff). 



Figs. 10 and 11. Human foetal brain at six and a half months (from Bischoff ). 



Figs. 12 and 13. Human foetal brain at seven months (from Bischoff). 



Figs. 14 and 15. Human foetal brain at seven and a half mouths (from Bischoff). 



FlGS. 16 and 17. Human foetal brain at eight months (from Bischoff). 



