65 



L.M.B.C. MEMOIRS 



No. XIV. LIGIA. 



C. GORDON HEWITT, B.Sc, 



Demonstrator in Zoology, University of Manchester. 





CONTENTS. 







PAGE 





PAGE 



Introduction 



. 66 



Vascular System . 



82 



Biology . 



. 67 



Nervous System . 



87 



External Characters . 



. 69 



Sensory Organs . 



88 



Appendages . 



. 72 



Excretory System 



90 



Body Wall, Muscular System 



Reproductive Organs . 



92 



and Body Cavity . 



. 75 



Development 



93 



Digestive System 



. 77 



Literature . 



96 



