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Show 188/.] ON THE PAIRED FINS OF CERATODUS. 3 Mr. Tegetemier exhibited and made remarks on some heads of the Sumatran Rhinoceros (Rh. sumatrensis), male, female, and young, forwarded from Sarawak, Borneo, by Mr. Brooke-Lowe. Prof. Bell exhibited a specimen of Nereis pelagica which he had received from his excellent correspondent Mr. R. L. Spencer of Guernsey, and which was remarkable for the bifid arrangement of the posterior portion of the body. He remarked that although Mr. Robertson, of Oxford, Dr. Horst, and himself had put on record Lumbrici with trifid ends, which probably were not really uncommon, he had not been able to find any record of a similar condition in a Polycheete. A communication was read from Messrs. H. B. Brady, F.R.S., "W. K. Parker, F.R.S., and T. Rupert Jones, F.R.S., containing an account of the Foraminifera procured on the Abrohlos Bank during the cruise of H.M.S. 'Plumper ' in 1857. This memoir will be printed in the Society's ' Transactions.' The following papers were read :- 1. O n the Skeleton and Affinities of the Paired Fins of Ceratodus, with Observations upon those of the Elasmo-branchii. By G. B . H O W E S , F.Z.S., F.L.S., Assist. Prof. of Zoology, Normal School of Science and Royal School of Mines, S. Kensington. [Eeceived December 14, 1886.] (Plates I.-III.) CONTENTS. page I. Introduction 3 II. O n the Structure of the Ceratodus Fins in general and of the Pelvic Fins in particular • • 4 III. O n the Pectoral member of Ceratodus compared with the Pelvic one of the same and the Pectoral one of the Plagiostomes 11 IV. O n the proximal Postaxial Elements of the Ceratodus Pelvic Fin ... 16 V. O n tbe Morphology of the Axis of the Ceratodus Fin 18 VI. O n the Homologies of the Chimseroid Fin-skeleton, as compared with that of Ceratodus 22 VII. Conclusions 24 VIII. List of Authorities referred to 24 IX. Description of the Plates (I.-III.) 26 I. Introduction. I have lately described (17, p. 277) the vertebral column of a Frog in connexion with which there had taken place, under dislocation of the urostyle, a process tantamount to that of reproduction of a lost part. While searching for literature bearing upon this subject, 1* |
