SCHEME OF THE CLASSIFICATION ADOPTED IN 



THIS BOOK 



MOLLUSCA 



Class 



GASTERO- 

 PODA 



Order 



/ Dibranchi- 

 ata 



Sub-order Section 



rOCTOPODA (p. 382). 

 ! CPhragmophora (p. 386) 



I Decapoda 



CEPHALO- I 

 PODA ^ 



J Sepiophora (p. 388), 

 Ichondrophora {^f^^^^^'^. 



Tetra- 

 branchiata 



fNAUTiLOiDEA / Retrosiphonata (p. 393). 

 JNAUTILOIDEA | pposiphonata (p. 395). 



Ammonoidea 



r Retrosiphonata (p. 397). 

 t Prosiphonata (p. 397). 



- , . fPOLYPLACOPHORA Cp.-400). 



Amphineura Japlacophora (p. 404). ^ 



Proso- 

 branchiata 



DiOTOCAKDIA 



''Docoglossa (p. 405). 



( Zygobranchiata 

 406). 



Rhipidoglossa 



I 



(p. 



I AzygohrancMata (p. 

 I 407). 



MONOTOCARDIA^ 



'Ptenoglossa (p. 411). 



Taenioglossa | ^Iffpoda (p. 411) 



^ \Heteropoda (p. 420). 



Gymnoglossa (p. 422). 

 Racliiglossa (p. 422). 

 ^Toxoglossa (p. 426). 



Opistho- 

 branchiata 



fBiilloidea-(p. 429). 



I; 



Tecti- I Aplysioidea (p. 430). 



BRANCHiATA I Pleurobraiichoidea (p. 431). 

 I Siphonarioidea (p. 431). 

 ASCOGLOSSA (p. 431). 

 ' NuDi- r Cladohepatica (p. 432). 



BRANCHIATA \ Holobepatica (p. 433). 



Pteropoda 



r Thecosomata (p. 435). 

 t Gymnosomata (p. 437). 



Pulmonata /Basommatophora (P- 438) 



t bTYLOMMATOPHORA (p. 439). 



