PEDIGREE OF MOLLUSCS. 



l6l 



Dibrancliia*' 



Heteropoda 



Pulmonata 



V_ 



Lipobranchia 

 Gymnobrancliia 



PleTU'obrancliia 



Opisthohranchia 



Prosohranchia 



Tetrabranchia 

 Cephalopoda 

 (eruttlts or ^oulpS) 



Sclerobracbia 



Sarcobrachia 

 Testicardines 



Ecardines 



Epirobranchia 



(3Lamp=sl)cUs) 



Chitonides 



D elocephala 



Inclusa 



Sinnpalliata 



Pteropodcf, 



Scaphopoda 



Integripalliata 

 Siphoniata 



Aisiphonia 

 LameUibranchia 



(fmusscls) 



Perocephala 

 Cochlides 

 (S'ltails) 



Otocardia 

 (Molltiscs with chamber and ante- 

 chamber to the heart) 



Promollusca (Primaeval Molluscs 

 Mollascs with simple heart 



(■Worms) 

 Gastrsea 



VOL. IL 



M 



