mollusca. 317 



Gastropoda {continued). 



Branchiopneusta. 



Lymnteus, Planorbis, Auricula. 

 Nephropneusta. 



Helix, Bulimus, Clausilia, Litnax, Arion. 



Pteropoda.* 



Thecosoruata. 



Hyalea, Cleodora, Chreseis, Cymbulia. 

 Gymnosomata. 



Clio, Pncumodermon. 



Cephalopoda.f 



Tetrabranchiata. 



Nautilus. 

 Dibranchiata. 

 Decapoda. 



Spirilla, Sepia, Sepiola, Loligo. 

 Octopoda. 



Octopus, Tremoctnpus, Eledone, Argonauta. 



Bibliography. 



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* In many points of their organisation the Pteropoda indicate a relationship to tho 

 Cephalopoda, but this can only be regarded as a very distant one. 



f Most of the oldest fossil forms probably belonged to the Tetrabranchiata, which 

 are represented by only one extant genus ; afc the same time these fossil forms varied 

 greatly in character. 



