SCHEME OF THE CLASSIFICATION ADOPTED IN 



THIS BOOK 



MOLLUSCA 



Glass 



CEPHALO- . 

 PODA ^ 



Order 



Dibranchi- 

 ata 



Sub-order 



Section 



rOCTOPODA (p. 382). 

 J rPhragmophora (p 



Idecapoba Jsepiophora(p,.388) 



j Nautiloidea 



branchiata 1 



Ammonoidea 



Tetra- 



Ichondrophora {^^^^^^^f^, 



/ Retrosiphonata (p. 393). 

 tProsiphonata (p. 395). 



f Retrosiphonata (p. 397). 

 \ Prosiphonata (p. 397). 



GASTERO- 

 PODA 



rPOLYPLACOPHOKA (p. 400). 



Amphmeura Japlacophora (p. 404). 



Proso- 



branchiata 



DiOTOCARDIA 



MONOTOCARDIA 



(p. 



'Docoglossa (p. 405). 



{Zijgohranchiata 

 406). 

 Azygobranchiata (p, 

 407). 



Rhipidoglossa 



'Ptenoglossa (p, 411), 



Taenioglossa I "Sf ^^'^^7 ^?;^ll^n\ 

 ^ \Heteropoda (p. 420). 



Gymnoglossa (p. 422). 



Rachiglossa (p. 422). 



Toxoglossa (p. 426). 



pulloidea (p. 429). 

 Tecti- J Aplysioidea (p. 430). 



BRANCHIATA j Pleurobraiichoidea (p. 431), 



Isiphonarioidea (p. 431). 

 ASCOGLOSSA (p. 431). 



Opistho- 

 branchiata \ Nudi- " r Cladohepatica (p. 432) 



BRANCHIATA \ Hololiepatica (p. 433), 



Pteropoda 



Pulmonata 



f Thecosomata (p, 435). 



t Gymnosomata (p. 437). 

 f Basommatophoka (p. 438). 

 \ Stylommatophora (p, 439). 



