Johnston, The Bram of Petromyzon. 83 



c. o. — conimissura olfactoria. 



c. p. — commissura posterior. 



ch. — chiasma of the optic nerve. 



ch. s. — chorda sheath. 



c. i. H. — commissura infima Halleri. 



com. c. — commissural cells in the medulla. 



c. s. — commissura superior. 

 (/. — dermis, 



d. h. M. — decussation of the bundles of Meynert. 

 d. III. — decussation of III nerve. 



d. h. — dorsal horn. 



d. p. — decussatio postoptica. 



e. — epistriatum. 



tpid. — epidermis. 



ep. — epiphysis. 



f. b. ven. — fore brain ventricle. 



f. I. p. — fasciculus longitudinalis posterior. 



f. c. — fasciculus communis. 



g. I. — granular layer of cerebellum. 

 g. h. — ganglia habenulae. 



gr. — granule cells of cerebellum. 



g. M. — ^iant cells of Miillerian fibers. 



H. z. — Hinterzellen. 



t. a. — internal arcuate fibers. 



I. a. P. —internal aicuate fibers from Purkinje cells. 



///. — third ventricle and third nerve. 



IV. — fourth ventricle and fourth nerve. 



/. t. — lobus inferior. 



L. I. I. — lobus lineae lateralis. 



/. /. Vlf. — the lateral line VII nerve and root. 



/. /. X. — postauditory lateral line root. 



/. m. c. — lateral motor column. 



/. 0. — lobus olfactorius. 



/. /. — lamina terminalis. 



/. V. — lobus vagi. 



m. — mitral cells. 



m. c. — motor cells. 



M. — Miillerian fibers. 



med. — medulla. 



n. b .l/.^nucleus of the bundles of Meynert. 



n. [If. — nucleus of the third nerve. 



n. c. p. — -nucleus of the commissura posterior. 



«. f. — nerve fibers ; nucleus funiculi. 



n. I. /. — the lateral line nerve. 



n. sp. f^.^nucleus trigemini spinalis. 



n. i., n. th. — nucleus thaeniae. 



o. — lower olive. 



0. p. — olfactory pit. 



