abe PROCEEDINGS OF THE CANADIAN INSTITUTE. 
Five nerves (the tenth, eleventh, twelfth, thirteenth and four- 
teenth) enter into the supply of the musculature of the ventral fin, 
branches for the superficial muscles forming an dependent plexus 
from thac into which the branches for the deep muscle enter. 
A general scheme for the more posterior nerves is represented in 
Fig. 6, Pl. [V., in which the rami dorsales are seen to furnish branches 
for the R. lateralis V. as well as branches for the interspinous muscles. 
Each R. ventralis, as described by Stannius, crosses over an inter- 
muscular septum into the following myotome, where the branches 
(Rmv) for the ventral parts of the lateral musculature are given off, 
and then all are connected by two longitudinal cords (like nervi col- 
lectores) from the nodal points of which the branches for the deep 
(mp) and for the superficial musculature (Ams) of the anal and 
caudal fins are derived. The infracarinal muscles are supplied by 
nerves which are apparently homodynamous with those going to the 
superficial musculature of the fins. 
The nineteenth to the thirty-third rami ventrales take part in the 
innervation of the anal fin, while the caudal fin receives the succeed- 
ing nerves, of which the two last pairs consist only of very strong 
ventral branches corresponding to the terminal swelling of the up- 
turned tip of the spinal cord. 
SYMPATHETIC NERVOUS SYSTEM. 
I have not devoted any attention to the sympathetic system ; a 
thorough study of it, especially in its relations to the somewhat 
puzzling suprarenal capsules of the Teleosts, would no doubt yield 
facts of much interest. 
The most readily-detected ganglia are to be found on the sides of 
the body of the first vertebra, giving off there branches with the 
branches of the aorta, as well as the ganglionated cord backwards 
along each of those vessels. Two branches of large size pass for- 
wards and downwards under the branchial veins and are joined by a 
transverse commissure under che basioccipital. Thence the anterior 
communicating branches to the ganglia of the vagus and trigeminus 
groups pass forwards. 
III. ORGANS OF SPECIAL SENSE. 
Although my detailed observations have been confined to what is 
unquestionably the point of highest interest in connection with the 
sense organs—the relationship of the air-bladder to the auditory 
