L.M.B.C. MEMOIRS. 



No. X. PATELLA. 



Professor T. I\. Ainswortii Davis, 



H. J. Fleure, B.Sc. 



Contents, 



PAGE 



Preface 1 



General Description 3 



External Characters G 



Body Wall, Muscular System, 



Mantle, etc 14 



Digestive Organs 20 



Nervous System, Sense Organs 3G 



PAGE 



Circulatory Organs and Coelom 46 



Respiratory Organs 53 



Excretory Organs 56 



Reproductive Organs 58 



Development 60 



Conclusions 63 



Explanation of the Plates 69 



Preface. 



The chief objects of tliis Memoir are: — 



(1) To provide a reliable account of the anatomy of 

 Pa tell a indgata . 



(2) To treat the subject matter so as to show the place 

 among Gastropods which this type occupies. 



The work has been carried out in tlie Zoolojrical 

 Laboratory of the University College of Wales ; and no 

 facts are included that we have been unable to personally 



