XIV CONTENTS. 



DIVISION II. 



PAGE 



VI. On the Anatomy of Amphioxus Lanceolatus . 371 



(Transactions Royal Society, Edinburgh, vol. xv.) 



VII. On Certain Peculiarities in the Structure op the 



Short Sun-fish (Orthagoriscus mola) . 394 



(Edinburgh New Philosophical Journal, vol. xxx.) 



VIII. On Gymnorhynchus horridus, a new Cestoid Ento- 



zoon .... 401 



(Edinburgh New Philosophical Journal, vol. xxxi. ) 



IX. On the Structure and Economy of Tethea . 405 



X. On an undescribed form of Gasteropod Mollusk 



from the Firth of Forth . . 420 



XI. On the Natural History and Anatomy of Thalas- 



SEMA AND ECHIURUS . . . 425 



(Edinburgh New Philosophical Journal, vol. xxx.) 



XII. On Pelonaia, a new Genus of Tunicated Mollusks, 



with Description of two Species . 435 



(Edinburgh New Philosophical Journal, vol. xxxi.) 



APPENDIX. 



I. On Asynchronism of the Auricular Contractions 



in the Reptilian Heart . . 443 



II. Notes on the Myology of the Elephant . 446 



