DESCRIPTION OF FIGURES. 293 



0. pr. — the ramus ophthalmicus profundus. 



0. pr. r. — fibres from Gasserian ganglion to lateral lobe of the first 

 sympathetic ganglion, supposed to enter the r. oph. profundus. 



op. s. VII. — ramus opercularis superficialis of the truncus hyoman- 

 dibularis. 



op. s. VII. I. to op. s. VII. J. — first to fifth branches of r. opercu- 

 laris superficialis VII. 



op. X. I. to op. X. 4. — branches of the ramus opercularis vagi. 



op. I. to op. 7. — organs of the opercular canal. 



0. r. I. — apparent origin of r. lateralis vag^. 



0. s. — m. obliquus superior. 



o. s. I. to 0. s. 6. — organs of the supra-orbital canal. 



0. V. — apparent origin of the V nerve. 



0. VI. — apparent origin of the VI nerve. 



0. X. — apparent origin of the vagus nerve. 



0. I. to 0. 4. — organs of the ventral opercular pit-line. 



0. J. — similar organ on the dorsal edge of the operculum. 



0. 6. — similar organ on the cephalic edge of the operculum. 

 pal. — the ramus palatinus facialis. 

 pb. — pseudobranch. 

 p. c. — posterior semicircular canal. 

 pc. n. — paracentral nucleus. 



ph. d. — branch of the vagus for the most caudal superior pharyn- 

 geal teeth. 

 ph. IX. — ramus pharjmgeus IX. 



ph. V. — branches of the vagus for the inferior pharyngeal teeth. 

 ph. X. Si.ndi ph. X. i. io ph. X. j>. — pharyngeal rami of first to third 

 branchial trunks. 



PO. — most dorsal post-orbital bone. 



POP. — preopercular bone. 



post, and pos I. i. to post 4. — post-trematic rami of the first to fourth 

 branchial trunks of the vagus. 



post. 2. d. and post. 2. v. — dorsal and ventral ramuli of the second 

 post-trematic ramus. 



pre. and pre. i. X.o pre. 2. — pre-trematic rami of the first to fourth 

 branchial trunks of the vagus. 

 PRO. — prootic bone. 

 PS. — parasphenoid bone. 



r. a. a. — ramulus acusticus ampullae anterioris. 

 r. a. e. — ramulus acusticus ampullae externae. 

 r. a. p. — ramulus acusticus ampullae posterioris. 

 r. b. — m. retractor bulbi. 

 r. buc. — ramus buccalis facialis. 

 r. car. — ramus cardiacus vagi. 



r. cerv. — ramus cervicalis, Fiirbringer; " hypoglossus " of authors. 

 r. com. — ramus communicans, or sensory portion of dorsal branch 

 of spinal nerves. 



u 



