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Show 1905.] OX THE n e r v e s o f c h l a m y d o s e l a c u u s a n g u i n e u s . 959 3. The Cranial and Spinal Nerves of CJdamydoselachus anguineus (Gar.). By Mrs. 0 . A. M ER R IT T H a w K E S , M.Sc. (Zoological Laboratory University ot Birmingham) *. j Received November 8, 1906.] (Plates LXVIII. & LXIX.f, and Text-figures 140, 141.) C o ntent s. A. Introduction. B. The Lateral Line System. C. The Ampullae of Lorenzini. D. The Eye, E)e-inuscles, and Nerves. E. The Trigemino-facial complex. i. The Trigeminal Nerve. (a) The ramus maxillaris. (f) The rami palatini V II . (g) The chorda tympani. F. The Glossopharyngeus. G. The Vagus. (a) The ramus lateralis vagi. (b) The first truncus (b) The ramus mandibularis. branchialis vagi. (<?) The ramus profundus. (c) The second ditto. (d) The ramus superficialis (d) The third ditto, ophthalmicus V. (e) The fourth ditto, ii. The Facialis Nerve. ( f ) The fifth ditto. (a) The ramus superficialis (g) The sixth ditto. ophthalmicus V II. (h) The ramus intestinalis. (6) The ramus buccalis. (c) The truncus hyomandibu-laris. (d) The ramus post-tremat-icus V II. (e) The ramus pre-trematicus V II . H. The Spinal Nerves. I . a . The Brain, b. Locy's Nerve. J. Summary. K. Bibliography. L. Explanation of the Plates. M. Reference-lettering. A. I n tr o d uc t io n . The following research was undertaken on the advice of Mr. F. J. Cole of Liverpool University, who, somewhat more than a year ago, sent me a specimen of Chlamydoselachus anguineus ( $ ), suggesting that I should dissect the cranial nerves. The specimen had been preserved in alcohol, but unfortunately the finer branches, or branches which were deeply situated, were not well preserved. Professor Bridge then kindly wrote for a formalin-preserved specimen ( S ) from Japan, of which he allowed me to dissect the viscera and one side of the head. Mr. G. A. Boulenger, of the Natural History Museum, South Kensington, allowed me to examine the specimens in his charge and to dissect the last branchial arch of one specimen. The alcohol-preserved specimen was in such a condition that microscopical work was quite useless. A number of stains were tried without success. Unfortunately the cranium had not been opened in the formalin-preserved specimen, but it has been possible to do some partially successful microscopical work on the nerves. I am hoping later to continue this microscopical work in order to add to and verify * Communicated by Professor T. W . B r i d g e , F.R.S., F.Z.S. f For explanation of the Plates, see p. 990. |