1905.] ON THE NERVES OF CHLAMYDOSELACHUS ANGUINEUS. 



959 



The Cranial and Spinal Nerves o£ CJdamijdoselacJais 

 angidneus (Gar.). By Mrs. 0. A. Mekkitt Hawkes, 

 M.Sc. (Zoological Laboratory University of Bir- 

 mingham) *. 



[Received November 8, 1906.] 

 (Plates LXVIII. & LXIX.f, and Text-figures 140, 141.) 



Contents. 



A. Introduction. 



B. The Lateral Line Sj-stem. 



C. The Ampullae of Lorenzini. 



D. The Eye, Eye-muscles, and Xerves. 



E. The Trigemino-t'acial complex. 



I. The Trigeminal Nerve. 



{a) The ramus maxillaris. 

 (6) The ramus mandibularis. 

 ((?) The ramus profundus. 



(/) The rami palatini VII. 

 {g) The chorda tj^mpaui. 

 r. The Glossopharyngeus. 

 G. The Vagus. 



(a) The ramus lateralis 



vagi. 

 {h) The first truncus 



branchialis vagi, 

 (e) The second ditto. 



{d) The ramus superficialis {d) The third ditto, 



ophthalmicus V. (e) The fourth ditto. 



II. The Facialis Nerve. , (/) The fifth ditto. 



{a) The ramus superficialis i (9) The sixth ditto. 



ophthalmicus VII. 1 (h) The ramus intestinalis. 



(i) The ramus buccalis. [ H. The Spinal Nerves. 



{c) The truncus hj^omandibu- ! I. a. The Brain, b. Locy's Nerve. 



laris. I J. Summarj'. 



{d) The ramus post-tremat- I K. Bibliography. 



icus VII. i L. Explanation of the Plates. 



(e) The ramus pre-trematicus I M. Reference-lettering. 



VII. 



A. Introduction. 



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 Ghlamydoselaehus 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 ( d ) 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. Beidge, F.R.S., P.Z.S. 

 t For explanation of the Plates, see p. 990. 



