CONTENTS 



CHAPTER VII 



MOLLUSCA 



PAGE 



Systematic Review ........ 2 



Class I. AMPHINEURA . . . . . . . 2 



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



III. SCAPHOPODA ....... 13 



IV. LAMELLIBRANCHIA (PELECYPODA, BIVALYA, 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 (CHITONID^E) . . . .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 



