NERVOUS SYSTEM. VERTEBRATA. 227 



The suprasylvian element in the Sylvio-suprasylvian 

 complex sulcus is very slightly developed on the left side, 

 and there is a small diagonal sulcus (S f ). 



The Sylvian trigone shades away anteriorly on the right 

 side, without any very definite terminal sulcus ; but on the 



Fig. 100. (x.) 



PARAFLOC.. 

 FON5. 



left side there is a faintly-marked oblique terminal sulcus, 

 which reaches almost as far as the lower extremity of the 

 presylvian sulcus (yS). 



The prorean sulcus (') is again separate only on the 



right side. 0.0. 1323 KC. 



Presented by the Zoological Society. 



D. 284. The brain-stem, with part of the cerebral hemispheres, 

 of a Great Anteater (Myrmecophaga jubata). 



This specimen is intended to show the corpus striatum 

 in the lateral ventricle ; the communication of the latter 

 with the olfactory ventricle ; the optic tract spreading out 

 on the optic thalaini ; the teenia thalarai and mesial geni- 

 culate body ; the corpora quadrigemina, of which the 

 posterior pair are the more prominent ; the insignificant 

 tractus peduncularis transversus ; and the broad pons over- 

 lapping to some extent the trapezoid bodies. 



D. 285. The brain of a Taniandua (Tamanduas tetradactyla) 

 (figs. 101, 102, 103, 104, 105 & 106). 



This is a smaller and correspondingly simplified copy of 

 the Great Anteater's brain. All traces of the "feline 



Q2 



