vi Journal of Comparative Neurology. 



innervated by the superficial ophthalmic. The buccal then divides into 

 two large bundles. One of these, the inner buccal, gives off 22 branches 

 supplying the inner buccal group of ampullae and the 26 sense organs 

 of the dorsal division of the infra-orbital line. The other bundle, the 

 outer buccal, supplies the 14 sense organs of the ventral division of the 

 lateral line and the outer buccal group of ampullae. The ampullae of 

 this latter group are only about half the size of those of the inner buc- 

 cal and superficial ophthalmic groups, but are larger than those of the 

 mandibular group. The external mandibular divides into two parts, 

 a posterior and an anterior. The posterior, which probably contains also 

 some fibers from the facial proper— as it anastomoses with the post- 

 branchial VII and sends twigs to the skin— innervates a small and prob- 

 ably degenerate group of ampullae and the 7 sense organs of the pos- 

 terior division of the hyomandibular canal. The anterior part supplies 

 the 1 1 organs of the anterior division of the hyomandibular canal and 

 the mandibular group of ampulla. These latter ampullce are not com- 

 pound but simple and kidney-shaped. 



The lateralis, which Cole includes in the Vllth nerve (see below), 

 " arises somewhat in front of and on a slightly higher level than the 

 roots of the vagus, and pardy in front of the glossopharyngeal." It is 

 readily shown by dissection to be quite independent of the vagus. 

 While in the cranium, it gives off a dorsal twig which unites with an- 

 other from the ganglion and innervates the occipital portion of the lat- 

 eralis canal. The main nerve proceeding backwards, expands into the 

 large lateralis ganglion immediately after passing through the vagus for- 

 amen. It then courses backward parallel to the lateralis canal which it 

 innervates for the whole of its length. This independent origin of the 

 lateralis, it may be noted, agrees with the condition found by others in 

 Elasmobranchs (Ewart), Teleosts (Herrick), Dipnoi (Pinkus) and Am- 

 phibia (Strong) and Cole himself vouches for it it Raia, Scyllium, Acan- 

 thias, Heptanchus, Laemargus and Torpedo. 



Besides noting the presence of a hitherto undescribed hard otolith 

 in the sacculus, no points of special interest were found in connection 

 with the auditory nerve which apparendy is similar to that of Lasmargus. 



"The ninth nerve in Chimera arises from the medulla by one 

 large root and two small rootlets below and under cover of the anterior 

 rootlets of the lateralis, as in all cartilaginous fishes. It passes through 

 the cranium by a separate foramen and immediately expands into an 

 obvious ganglion. From this ganglion the very fine dorsal branch 

 arises, which does not, however, innervate any sense organs of the 

 lateral line but passes straight upwards to the skin of the occipital re- 



