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XXXIII. — Anatomy and Physiology of Patella vulgata. Part I. Anatomy. 

 By P. J. Harvey Gibson, M.A. Communicated by Professor Herd- 

 man, D.Sc. (Plates CXLIX.-CLIII.) 



(Read 5th January and 20th July 1885.) 

 CONTENTS. 



Introduction, 601 



Historical Account, 601 



Morphology : 



1. External Form — General Arrangement 



of Viscera, 603 



2. Alimentary System, .... 605 



PAGE 



3. Circulatory System, . . . .613 



4. Purificatory Systems, . . . 614 



5. Muscular, Connective Tissue, and 



Epidermal Systems, . . . 620 



6. Nervous System and Sense Organs, . 626 



7. Reproductive System, . . . 633 



Introduction. 



The following research was undertaken chiefly with the object of furnishing 

 a complete memoir on the morphology and physiology of Patella vulgata. A 

 number of isolated observations on various organs are recorded, but no 

 systematic account has as yet been written, so far as the writer is aware. He 

 has endeavoured to incorporate these observations in such a general account, 

 having first convinced himself of their accuracy so far as lay in his power. 



The paper is divided into two sections. Part I. deals solely with Anatomy 

 and Histology ; Part II. will contain an account of the Physiology of the 

 systems described in Part I. An attempt will be made to give a description 

 of the as yet uninvestigated development of Patella. These observations will 

 doubtless afford material for certain conclusions bearing on the phylogeny of 

 the Patellidw. 



All the observations described in Part I. were made on specimens obtained 

 from Granton, the Gareloch, Loch Goil, and Firth of Clyde, fresh or preserved 

 in spirit, or a saturated solution of picric acid. 



The research was conducted in the Zoological Laboratory of University 

 College, Liverpool ; and the author is indebted to his friend Professor Herd- 

 man, D.Sc, not only for permission to make these observations in his labora- 

 tory, but also for constant advice during the prosecution of the work. His 

 best thanks are also due to Dr Murie, F.L.S., for the great assistance rendered 

 by him in the bibliography of the subject. 



Historical Account. 

 As indicated above, the investigations into the minute anatomy of the 

 limpet are not numerous, and with few exceptions exceedingly fragmentary 

 and contradictory. Dall, in a recent paper, afterwards to be referred to, 



VOL. XXXII. PART III. 5 H 



