102 PROFESSOR J. C. EWART AND MR J. C. MITCHELL ON THE 



BIBLIOGRAPHY.* 



(1) Ewart, "The Sensory Canals of Laemargus," Roy. Soc. Trans. Edin., vol. xxxvii. part i. p. 59. 



(2) Ewart, "The Cranial Nerves of Elasmobranch Fishes," Roy. Soc. Proc, vol. xlv., 1889. 



(3) Sappey, Etude sur Vappareil mucipare, &c, 1879. 



(4) Merkel, Ueber die Endigungen der sensiblen Nerven in der Haut der Wirbelthiere, Rostock, 1880. 



(5) Garm&n, "On the Lateral Canal System of the Selachia," Bull. Mus. Comp. Zool, Cambridge, Mass., 



vol. xvii. No. 2. 



(6) Fritsch, Die Electrischen Eiscke Die Torpedineen, Leipzig, 1890. 



(7) Allis, "The Anatomy and Development of the Lateral Canal System of Amia calva," Journal of Morpho- 



logy, vol. ii., 1889. 



(8) Leydig, Lehrbuch d. Histologie des Menschenu. d. Thiere, 1857. 



(9) Solger, "Neue Untersuchungen zur Anatomie der Sectenorgane der Fische," Arch, fur mikro Anat., 



1879-80. 



EXPLANATION OF PLATES.— PLATE I. 



Fig. 1. The sensory canals of the head and part of the lateral canal of the trunk, and the nerves which 

 innervate their sense organs. The position and relations of the various canals and nerves have 

 been represented as accurately as possible from actual dissections. 



S.O.-S.0. 4 , The supra-orbital canal. S.O., where the canal begins on the dorsal surface in connection 

 with the infra-orbital; S.O. 1 , the middle of the great dorsal outward curve ; S.O. 2 , where the canal 

 dips into the snout to reach the under surface ; S.O. 3 , the canal as it arches over the nasal capsule ; 

 S.O. 4 , the end of the supra-orbital canal communicating with the infra-orbital. The tubules by 

 which the canal communicates with the exterior are shown on the right side ; the ventral part of 

 the canal is represented by dotted lines. 



s.o.f, The superficial ophthalmic branch of the facial nerve. On the right side it is represented as 

 giving off numerous branches which enter the canal and terminate in the sense organs (hillocks) ; 

 .s.o./. 2 , the deep or ventral branch which supplies the distal portion of the supra-orbital canal. The 

 ophthalmic branch is represented as being intimately related at its origin with the buccal (bu.) and 

 hyomandibular (lim.) branches. The fibres which supply the ampullae of the ophthalmic group of 

 ampullary canals are not figured, s.o.f. 1 , the ganglion of the superficial ophthalmic branch of 

 the facial. 



I.O.-I.O. 5 , The infra-orbital canal. I.O., the infra-orbital in contact with the supra-orbital; 

 I.O. 1 , where the canal, after it has reached the ventral aspect, communicates with the hyo- 

 mandibular (HM.) ; I.O. 2 , where it communicates with the supra-orbital; I.O. 3 , the ventral loop ; 

 I.O. 4 , where the two infra-orbitals meet in the middle line; I.O. 5 , the infra-orbital terminating at the 

 front of the snout. The tubules are as far as possible represented on the left side of the figure ; 

 the ventral tubules have been represented as running obliquely outwards, but in reality the majority 

 of them project directly downwards from the under surface of the canal, ot., the (otic) part of the 

 infra-orbital canal continuous with the lateral canal (Ip.) ; bu., the buccal branch of the facial; on 

 the left side, the buccal branches to the infra-orbital canal are shown ; ot.n., the branch to the otic 

 portion of the infra-orbital springing from the buccal ganglion (bu.gl.) ; 6m. 1 , the inner branch of the 

 buccal which supplies the greater part of the canal beyond its connection with the supra-orbital, 

 and also the inner buccal group of ampullae ; bu. 2 , the outer branch of the buccal which sends the 

 most of its fibres to the outer buccal group of ampullae. 



1IM.-HM. 1 , The Hyomandibular canal, inn., the hyomandibular branch of the facial with its 

 ganglion (hm.gl.). It sends most of its fibres to the hyoid group of ampullae, but a slender branch, 

 km. 1 , supplies the sense organs of the hyomandibular canal. 



* A more complete list will be found appended to the paper on Lsemargus. 



