3IO 



NEBVOUS SYSTEM OF VERTEBRATES. 



rec.^ 



parA. 



B 



Fig. 152. — Sketches of transverse sections through (A) the caudal part of the 

 epistriatum in amphibia and (B) the corresponding structure in Ornithorhynchus. 

 B from G. Elliot Smith. In A the tracts are drawn from the brain of Nechtriis 

 and the cells in the epistriatum (£) are dra\Yn schematically to show their disposition 

 next the venticle and the continuity of the cell layer through the foramen of Monro 

 with that of the hippocampal formation {Hipp.), c, the tractus cortico-habenularis. 

 On the right side the section is supposed to pass just behind the foramen of Monro. 



In B: f.d., fascia dentata; f.m., foramen of Monro; hip., hippocampus; ne., 

 neopallium; para., paraterminal body; plx.l., choroid plexus of the lateral ventricle ; 

 rec.s., recessus superior. The recessus superior extends dorsad between two 

 vertical shaded lateral walls which correspond to the caudal part of the epistriatum 

 in amphibia. This is erroneously called the paraphysis in mammals. 



