540 MR. X. G00DEY ON THE SKELETAL [Mar. 15, 



The following papers were read : — 



1. A Contribution to the Skeletal Anatomy of the Frilled 

 Shark, CMamydoselachus anguineus Gar. By T. Goodey, 

 M.Sc. (Birm.), Research Scholar, University of 

 Birmingham *. 



[Received February 14, 1910.] 



(Plates XLII.-XLVI.f) 



Contents. 

 I. Introduction. 

 II. Measurements. 



III. The Skull, Visceral and Branchial Arches. 



a. Cranium. 



b. Labial Cartilages. 



c. First and second Visceral Arches, Ligaments and Muscles. 



d. Branchial Arches. 



e. Branchial Rays. 



f. The Spiracle. 



g. Features of specialization and comparison with Notidanid*. 



IV. The Membranous Labyrinth. 

 V. The Vertebral Column. 



h. Description of regions 1, 2, 3, & 4. 



i. Summary of special features and comparison with Notidanidte. 

 VI. The Pectoral Girdle and Fin. 

 VII. The Pelvic Girdle and Fin in the female. 

 VIII. The Mixipterygia (Copulatory Appendages). 

 j. Measurements. 

 1c. Externals. 

 I. Musculature. 

 m. Skeleton. 

 IX. The Median Fins. 

 X. Summary. 

 XI. Literature. 

 XII. Explanation of Plates and Reference Letters. 



I. Introduction. 



The present paper is the outcome of a piece of research, carried 

 out in the Zoological Laboratory of the University of Birmingham, 

 on the skeletal anatomy of the primitive Selachian Chlamydo- 

 selachus anguineus. 



The work was suggested by the late Prof. Bridge, and a large 

 part of it, that dealing with the skull and vertebral column, was 

 carried out under his supervision. I should like here to say how 

 much I appreciate the opportunity of using such valuable material, 

 and to express my gratitude for the helpful criticism which my 

 late teacher was always willing to give. The material included 

 one perfectly complete male specimen, the greater part of a large 

 female specimen, and the remains of another male, which was 

 principally in the form of parts set up as museum specimens. 



* Communicated by Dr. P. Chalmers Mitchell, M.A., F.R.S. 

 f For explanation of the Plates see page 570. 



