476 Proceedings of Boycd Society of Edinhiirgh. [sess. 
lain for some time in spirit, the dorsal branch of the IX, in addition 
to sending two twigs to the skin over the auditory capsule, supplied 
the three sense organs of the lateral line lying immediately posterior 
to the commissural canal (see fig. 1). This dorsal branch leaves the 
main trunk anterior or proximal to the ganglion, and, after accom- 
panying the main trunk for a short distance, runs upwards through 
the cartilage of the auditory capsule. When about half wmy up it 
bends slightly inwards and forwards, and, before leaving the capsule, 
Fig. 1. — Diagram of dorsal branch of IX of Loemargus microcephalus. Gl., 
glossopharyngeal ; D., dorsal branch. Xote the 3 twigs to the canal. 1., 
Lateral canal; Ic., commissural (lateral) canal; cut., cutaneous branches; 
D'., branch to inner-postero W'all of cranium ; L., lateralis ; L'., branch of 
lateralis to commissural canal and most anterior portion of lateral canal. 
divides into two branches — the slender branch to the most anterior 
sense organ leaving the capsule by a foramen placed lower than 
the other and easily escaping notice. A corresponding branch 
has not yet been found in Raia or in any other Elasmobranch. It 
may be mentioned that in Amia, according to Allis {ibid., p. 516), 
the dorsal branch arises by a separate root, which may pass through 
the skull by a separate foramen, and has a distinct ganglion ; but 
no ganglion cells were found in the dorsal branch of Lcemargus. In 
