CONTENTS 



CHAPTER VII 



MOLLUSCA 



PAGE 



Systematic Review ........ 2 



Class I. AMPHINEURA .... 2 



II. GASTROPODA (CEPHALOPHORA) ..... 3 



III. SCAPHOPODA ....... 13 



IV. LAMELLIBRANCHIA (PELECYPODA, BIVALVA, ACEPHALA, 



AGLOSSA) ....... 14 



V. CEPHALOPODA . . . .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 (CHITONHXE) . . 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 



