Herrick, Nerves of Silurotd Fishes. 247 
PRO.—prootic bone. 
pros.—prosencephalon. 
PS.—parasphenoid bone. 
PT.—post-temporal (supra-clavicular) bone. 
r. ad. man.—branch of trigeminus for m. adductor mandibulae. 
r. ad. pal.—branch of facialis for m. adductor arcus palatini. 
. 6uc.—ramus buccalis facialis. 
. cut. dors, X.—ramus cutaneus dorsalis vagi. 
Ay.—ramus hyoideus facialis. 
!. a. ~.—branch of r. mandibularis V for m. levator arcus palatini. 
lat. ac.—ramus lateralis accessorius (r. recurrens facialis). 
fat. X.—ramus lateralis vagi. 
man.—ramus mandibularis trigemini. 
. man. ext. V7J.—main ramus mandibularis externus facialis. 
. max.—ramus maxillaris trigemini. 
r. op.—ramus opercularis profundus (for mm. adductor hyomandibularis, 
levator operculi and adductor operceuli). 
r. oph. sup. V.—ramus ophthalmicus superficialis V. 
r. oph. sup. VI/.—ramus ophthalmicus superficialis VII. 
r. ot.—ramus oticus facialis. 
r. pal.—ramus palatinus facialis. 
r, pt. Vil.—ramus palatinus posterior (r. pre-trematicus facialis ?). 
r. 5.—m. rectus superior. 
So SURE RE NSH tL SES 
r. st. {X.—ramus supra-temporalis glossopharyngei. 
r. S. 5.—buccal branch for fifth organ of sub-orbital canal. 
Ss. gel.—substantia gelatinosa. 
So. c.—supra-orbital canal. 
SOr.—first sub-orbital bone (or lachrymal, or antorbital). 
S02 to SO7.—second to seventh sub-orbital bones. 
sp. g. 2.—second spinal ganglion. 
sp. V.—spinal V tract. 
sp. r.—branch of r. lateralis accessorius for ventral ramus of first spinal 
nerve. 
sp. 2.—branch of r. lateralis accessorius for ventral ramus of second spinal 
nerve. 
SQ.—squamosal (pterotic) bone. 
sup. lat.—supero-lateral strand (general cutaneous) of infra-orbital trunk. 
sy.—sympathetic nervous system. 
#, 4.—tuberculum acusticum. 
#. At.—hyomandibular trunk. 
“.—point of union of infra-orbital-and supra-orbital canals. 
v. lat. X.—ventral branch of r. lateralis vagi. 
v. l. g.—ganglion of the ventral lateralis root of the facialis. 
v. 2. v.—ventral lateralis root of the facialis. 
