152 JOHN BEARD. 
DESCRIPTION OF PLATES VIII, IX, & X, 
Illustrating Dr. Beard’s paper on “ The System of Branchial 
Sense Organs and their Associated Ganglia in Ichthyopsida.” 
In mosf cases the objective and ocular used for each drawing are denoted 
by letters, such as Z. p, oc. 2, which signify Zeiss’s objective D, ocular No. 2. 
The figures are mostly camera drawings, and are all reduced to one third of 
their apparent enlargement. 
Alphabetical List of References. 
I, Il, v, vu, &c. Olfactory, motoroculi, trigeminal, facial, &c., nerves. 
al. c. Alimentary canal. aud. and au. o. Auditory organ. az. gl. Auditory 
ganglion. au. . Auditory nerve. 67. Brain.  r. gl. Branchial ganglion. 
ér. o. Branchial sense organ. c. 4. Nerve connecting ciliary and Gasserian 
ganglia. c. gl. and cil. gl. Ciliary ganglion. ci/. Ciliary. cl. Cleft. cd. vi. 
Sixth cleft. ep. Hpiblast. . dr. Fore-brain. f. gl. Facial ganglion. fac. 
Facial. Gass. Gasserian. G.gl. Gasserian ganglion. g/l. g/. Glossopharyngeal 
ganglion. gloss. Glossopharyngeal. %. dr. Hind-brain. 4. c. Head-cavity. 
h. ¢.. Second head-cavity. Ay. cl. Hyoid cleft. 7. e. Indifferent epiblast. 
2.1. Lateral line. 7.2. Lateral nerve. 7. m. Lateral muscle plates. m. 
Mouth. m. dr. Mid-brain. me. Mesoblast. ms. Inter-muscular septa. 2. 
Notochord. 2. c.g/. Nerve of ciliary ganglion. .s. Nervous system. 
olf. gl. Olfactory ganglion. olf. x. Olfactory nerve. o/f. 0. Olfactory organ. 
oph. pro. Ophthalmicus profundus. op. s. Ophthalmicus superficialis of fifth 
nerve. p. dr. o. Primitive branchial sense organ. p. 6.7. Preebranchial nerve. 
p.f. Portio facialis of ophthalmicus superficialis—one suprabranchial nerve of 
facial. p.a. Postbranchial nerve. y.7. Posterior root. 7. 4. Ramus buccalis, 
the second suprabranchial nerve of the facial. sd. 2. Suprabranchial nerve. 
sp.¢. Spinal cord. sp.g/. Spinal ganglion. sm. 6. Smell-buds.  s. ¢. v. Supra- 
temporal branch of vagus 1. s. ¢. g. Supratemporal branch of glossopharyngeal. 
vg. gl. Vagus ganglion. vg.1. Vagus ganglion 1. 
PLATE VIII. 
Fig. 1.—Olfactory nerve just fusing with olfactory thickening. T. ocellata. 
Z. p, oc. 2, camera. off. m. Olfactory nerve. o/f o. Olfactory thickening. 
Fie. 2.—Olfactory ganglion (0/f. gi.) and olfactory thickening (o/f 0.) fused 
together. Torpedo ocellata. Z. D, oc, 2, cam. luc. 
Fie. 3.—Transverse section of olfactory organ (o/f. 0.) and nerve (olf. x.) 
in Rana temporaria. Z. ©, oc. 2, cam. luc. 
