CONTENTS IX 



XVII 



PAGE 



ON THE MORPHOLOGY OF THE CEPHALOUS MOLLUSCA, AS ILLUSTRATED BY 

 THE ANATOMY OF CERTAIN HETEROPODA AND PTEROPODA COLLECTED 

 DURING THE VOYAGE OF H.M.S. "rattlesnake" IN 1846-50 . ... 152 



Philosophical Transactions of the Royal Society, vol. cxliii. 1853, ft. 2. 

 ff. 29-66. 



XVIII 



researches INTO THE STRUCTURE OF THE ASCIDIANS I94 



British Association Report, 1852, pt. ii. pp. 76-77- 



XIX 



ON THE ANATOMY AND DEVELOPMENT OF ECHINOCOCCUS VETERINORUM . I97 

 Proceedings of the Zoological Society, vol. .xx. 1852,//. 1 10-126. 



XX 



ON THE IDENTITY OF STRUCTURE OF PLANTS AND ANIMALS .... 2l6 



Abstract of a Friday Evening Discourse delivered at the Royal Institntion 

 on April 15, 1853; Proceedings of the Royal Institntion, i. 1851-4, 

 pp. 298-302; Edinburgh New Philosophical Journal, liii. 1852, 

 pp. 172-177. 



« 



XXI 



OBSERVATIONS ON THE. EXISTENCE OF CELLULOSE IN THE TUNIC OF 



ASCIDIANS . . 221 



Quarterly Journal of Microscopical Science, i. 1853. 



XXII 



ON THE DEVELOPMENT OF THE TEETH, AND ON THE NATURE AND IMPORT 



OF NASMYTH'S "PERSISTENT CAPSULE" . . . . . . 224 



Quarterly Journal of Microscopical Science, i. 1853. 



XXIII 



THE CELL-THEORY (REVIEW) . . 242 



British and Foreign Medico-Chirurgzcal Review, vol. xii. 1&S5> PP- 2S5-314. 



XXIV 



ON THE VASCULAR SYSTEM OF THE LOWER ANNULOSA 279 



British Association Report, 1854, pt. ii. p. 109. 



XXV 



ON THE COMMON PLAN OF ANIMAL FORMS 28 1 



Abstract of a Friday Evening Discourse delivered at the Royal Institution 

 on May 12, 1854. Proceedings of the Royal Institution, vol. i. 1851-4, 

 pp. AiA-iAd. 



