HeErRRIcK, Werves of Siluroid Fishes. 245 
DESCRIPTION OF FIGURES. 
All of the figures illustrating this paper, except Fig. 14, have been drawn 
from a single series of sections through the head and body of Ameturus melas, 
prepared by the WEIGERT process, as detailed in the introductory section of 
this paper. 
REFERENCE LETTERS. 
@.—general cutaneous root of the r. ophthalmicus superficialis V. 
ac. mx.—accessory maxillary nerve. 
ac. mx. c.—general cutaneous root of accessory maxillary nerve. 
a. /.—anterior pit line. 
a. ®. a.—anterior nasal aperture. 
ART.—articular bone. 
ASP.—alisphenoid bone. 
6. v.—blood vessel. 
¢.—communis root of r. ophthalmicus superficialis V. 
cereb.—cerebellum. 
cl.—clavate cells of Leydig. 
com.—communis root of the facialis. 
com. X.—communis root of the vagus. 
cut. dors.—ramus cutaneus dorsalis vagi. 
cut. m. ex. V7J,.—cutaneous branch of r. mandibularis externus VII. 
cut. V.—general cutaneous root of the trigeminus. 
cut, X.—general cutaneous root of the vagus. 
d.—dermis. 
D.—dentary bone. 
d. /.—branch of r. lateralis vagi for dorsal pit line of trunk. 
@. lat. X.—dorsal (main) branch of r. lateralis vagi. 
d. 1. g.—ganglion of the dorsal lateral root of the facialis. 
d. 1. r.—dorsal lateralis root of the facialis. 
e.—epidermis. 
ESC.—extrascapular (supratemporal) bone. 
éuc.—foramen of r. buccalis facialis. 
7X.—foramen of glossopharyngeus. 
Jat. ac.—foramen of r. lateralis accessorius. 
“7. X.—foramen of the vagus. 
os. V.—foramen of r. ophthalmicus superficialis V. 
os. V{J.—foramen of r. ophthalmicus superficialis VII. 
ot.—foramen of r. oticus. 
'  F., pt. Vi7.—foramen of r. palatinus posterior. 
#R.—frontal bone. 
Ft. hm.—foramen of truncus hyomandibularis. 
F. t. ¢.— foramen of infra-orbital trunk. 
F. 5.— foramen for nerve for fifth organ of supra-orbital canal, 
gen. g.—geniculate- ganglion. A 
g. 7X.—ganglion of the glossopharyngeus, 
Vas BBBA 
