811 



and laler bridges across the floor of the fissure separating the telence- 

 phalon from the diencephalon (Fig. XI). In this situation it forms 

 a conspicuous oval bundle which is visible in the sections to the 



Co -- 



T-r SC th 



naked eye. This tract i.*^ tlie principal constituent of the taenia 

 tludami representing tiie element called oi/acto-hahenii/ar by Edinger 

 and Wallenberg (1899), p. 251). A similar tract is figured by 

 Edinger, Wallenbekg and Holmks (Taf. V) and Schroedkk (Fig. 47) 

 but in these cases it is of considerably smaller dimensions than that 

 attained in the kiwi. The condition of preservation of the specimen 

 prevents the identification ot' a. nuclen.i taeniae. When traced medially 

 the tract pas.ses to the lateral a¥|>ect of the ganglion liabenulae and 

 gradually ends in il. Many fibres cross the median plane returning 

 apparently to the forebrain on the other side forming a very con- 

 spicuous commissiira telencephali superior (Fig. XII). In reviewing 



' Tr 5ep r^ei 

 Tr off. hob. 



the fibre tracts of the avian brain, Ariëns Kappers (1921, p. 1046) 

 considers that the presence of this commissure in birds is question- 

 able, though it is clearly present in all animals (cf. Varanus sal- 



53* 



