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COMPARATIVE MORPHOLOGY OF VERTEBRATES 



Fig. i8i. — Ventral view and median section of the brain of Ornithorhynchiis, after 

 G. Elliot Smith. AC, anterior commissure; bo, olfactory bulb; c, first cervical nerve; 

 cl, cerebellum; CM, massa intermedia; e, epiphysis;/, flocculus; /i, fasciculus dentatus 

 (anterior part of hipp>ocampal tract); Ji, interventricular foramen; h, hj-pophysis; 

 he, habenular commissure; HC, pallial (hippocampal) commissure; Ip, pyriform (hippo- 

 campal) lobe; mc, mammillary bodies; wo, medulla oblongata; «, nodulus; o/, olfactory 

 lobe; ot, olfactory tubercle; pal, pallium (temporal lobe); pc, posterior commissure; rf, 

 rhinal fissure; tc, tuber cinereum; tV, tuberculum quinti; v, velum meduUare anterius; 

 mv, motor root of V nerve; vmd, mandibularis root of V; vmx, maxillary root of V. 



