812 



vator, as figured by de Lanok, 1911, fig. 25, wliere the conuni.i.tnr a 

 telencephali superior is shown). Co-existing with fiiis commissure in 

 Varanus is a well-marked couinii.ssiira paUii posterior or commissara 

 aherrmis of Elliot Smith (dk Ijange, 0|). cit. fig. 21) wiiicli is 

 absent in Aves. The relations of tlie tract forming tlie commissura 

 in the kiwi are so precise that there can he no doubt that the 

 commissure pi-eseiit here is not tiie commissura paUii posterior, but 

 the commissurii telencephali superior (cf. Ariëns Kappehs, 1921, 

 p. 797 and footnote; p. J034) 1 am unable to recognise the cojht/uV 

 snr(f pnllii (cf. Schhoeder fig. 42) in the .sections under examination. 

 Tlie remaining fibres of the ventrally situated fibre field constitute 



Trfr.ef. 



Trbcp nies 



Rj. VIll 



tlie fronto-occipital (froiito-epistriatic or lobo-epistriatic) tract. This 

 arises over a wide area of the ventral aspect of the hemis|)here as 

 described by Edingek, Wallenberg and Holmes (1203), (p. 381 and 

 Fig. 56) in the kiwi this tract can be traced to the posterior eiul 

 of the corpus striatum where its fibres terminate. It is here seen to 

 be augmented considerably by the addition of another great bundle 

 of fibres, the connexions of which are also fronto-occipital. This 

 tract first becomes distinct immediately dorsal to the slight lateral 

 extension of the dorsal part of the lateral ventricle in the cortex 

 region (Fig. V), but it soon appears on the ventricular aspect of 

 the corpus striatum also and increases in size until it is a very 

 extensive tract. It contributes a few fibres to the commissura anterior 

 (Fig. IX) and then becomes merged with the fronto-occipital bundle 

 alread}' described to form a conspicuous tract which is oval in 

 cross section (Fig. XIV). Similar fibres to these are described by 

 Edinger, Wallenberg and Holmes (op. cit. p. 383) who figure the 

 fronto-occipital bundle divided into a dorsal and ventral part in the 

 sparrow (Taf. II, Fig. 4). Schroedeh, (1911, p. 145) in his excellent 



