CONTENTS 



CHAPTER VII 



MOLLUSCA 



Systematic Review .... 

 Class I. Amphineuka 



II. Gastropoda (Cephalophoea) 



III. SCAPHOPODA 



IV. Lamellibranchia (Pelecypoda, 



Aglossa) 

 V. Cephalopoda 



Bivalva, Acephala, 



PAGE 



2 



2 



3 



13 



14 

 21 



I. Organisation of the Primitive Mollusc ... 26 



II. Review of the Outer Organisation characterising the 



Chief Groups of the Mollusca .... 28 



A. Placophora or Polyplacophora (Chitonid^) ... 29 



B. Aplacophora, Solenogastres ..... 29 



C. Gastropoda (Cephalophora) ..... 30 



D. SCAPHOPODA ....... 34 



E. Lamellibranchia ....... 34 



F. Cephalopoda ....... 36 



III. The Integument, the Mantle, and the Visceral Dome . 39 



A. Placophora ....... 39 



B. Solenogastres ....... 41 



C. Gastropoda ....... 42 



D. ScAPHOPODA . . . . . . .49 



E. Lamellibranchia ....... 49 



F. Cephalopoda ....... 53 



IV. The Shell ........ 55 



A. Amphineura ....... 58 



B. Gastropoda ....... 58 



