84 Journal of Comparative Neurology. 



p. — Purkinjt' cells. 

 p. — parapbysis. 

 //. c. — choroid plexus. 



R. — Reissner's fiber. 



r. /.^recessus praeopticus. 



r. po. — recessus postopticus. 



s. — corpus striatum. 



sac. — saccus vasculosus. 



s. c. -sense cells. 



s. f. — sensory fibers. 



sp. c. — spindle cells. 



sp. c. f.— neurites of spindle cells. 



sp. V. — spinal V tract. 



th. — thalamus. 



t. o. — tectum opticum. 



tr. h.-t. — tractus bulbo-tectalis. 



tr. e.-s. — neurites of epistriatum cells. » 



tr. l.-b., tr. l.-h. -\-c. — tractus lobo-bulbaris et cerebellaris. 



tr. m.-/i. — tractus mammillo-bulbaris. 



ir. o.-h. — tractus olfacto-habenularis. 



tr. olf. — tractus olfactorius. 



tr. op. — tractus opticus. 



tr. s.-th. — tractus olfacto-lobaris. 



/'-. th.-e. — tractus lobo-epistriaticus. 



tr. th.-sac. — tractus thalamo-saccus. 



tr. t.-th. — tractus thaenia-thalamicus. 



tr. t.-h. — tractus tecto-bulbaris. 



tr. t.-l. — tractus tecto-lobaris. 



V. m. c. — ventral motor column. 



i»i. — first motor spinal nerve. 



fs. — first sensory spinal nerve. 



2S. — second sensory spinal nerve. 



Vf. — nerve called by Ahi.born the abducens. 



Vlf. — the seventh nerve proper, i. e., fasciculus communis and motor roots. 



VII-X. — anastomosis of pre- and post-auditory lateral line components. 

 IX, X. — the ninth and tenth nerve roots. 



PLATE I. 



Ft!;. I . Lateral view of the brain magnified about 30 diameters. The 

 roots of the cranial nerves are inserted diagrammatically from sections. The 

 roots of VTI and VIII sppear a little too far caudad. From a specimen of 

 which the whole head was hardened in 20 per cent, formol. 



Fig. 2. Median sagittal section of the brain to show form of cavity and 

 the position of commissures. The small figure to the right is a horizontal 

 section of the inferior lobes. 



Figs. 3-20. A series of transverse sections inclined forward in the plane 

 of Meynert's bundles. Owing to difference in curvature of different brains it 



