TABLE OF CONTENTS. 



MOLLUSCA 



I. LAMELLIBEANCHIATA 



1. Asiphonia 



2. Siphoniata 



II. SCAPHOPODA 



III. GASTROPODA 



1. Prosobranchiata . 



1. Placophora . 



2. Cyclobranchiata 



3. Zeugobranchiata 



4. Ctenobranchiata 

 branchiata) . 



2. Heteropoda . 



3. Pulmonata . 



1. Ba^ommatophora . 



2. Stjli^nmatophora . 



4. Opisthobranchiata 



1. Tectibranchiata 



2. Nudi branchiata 

 3. 



IV. PTEROPODA 



1. Thecosomata 



2. Gymnosomata 



V. CEPHALOPODA . 



1. Tetrabranchiata 

 _. Dibranchiata 



1. Decapoda 



2. Octopoda . 



MOLLUSCOIDEA . 

 I. BRYOZOA . 



1. Endoprocta . 



2. Ectoprocta . 



1. Lophopoda (Ph; 

 mata) . 



2. Stolmatopoda (G 

 mata) . 



