THE SENSORY CANAL SYSTEM OF FISHES. 499 
The Sensory Canal System of Fishes. 
Part I.—Ganoidei. 
By 
Walter Edward Collinge, 
Demonstrator of Zoology and Comparative Anatomy, Mason College, 
Birmingham. 
With Plates 39 and 40. 
ContTENTS. 
PAGE | PAGE 
i. Introductory . : 7) A99 x. Acipenser sturio . 521 
ii. Historical . : . 500 xi. Summary and Conclusion 524 
iii, Nomenclature : . 502 xii. Comparison of Polydon 
iv. Function : : . 504 with Acipenser . 525 
v. The Cranial and other xiii, Comparison of the Sela- 
Bones ; é . 506 choid Ganoids with the 
vi. Polyodén folium . 507 Elasmobranchii . . 526 
vii, Innervation of the Canals, xiv. Comparison and review of 
&e. . 5 5 . 514 the Septum in the Ga- 
viii. Psepherus gladius . 519 noidei sling The . 527 
ix. The Cranial and other xv. Classification . : . 529 
Bones ; : . 520 | xvi. Bibliography . : . 530 
i, INTRODUCTORY. 
I HAVE been led to take up these investigations upon the 
sensory canal system of fishes at the suggestion of Professor 
Bridge, to whom I am deeply indebted for the very generous 
manner in which he has placed at my disposal specimens of 
very many valuable Ganoids and Teleosts, and for his valuable 
criticism, assistance, and advice. 
voL. 86, PART 4,—NEW SER. L L 
