I. Thierreich. — VII. Mollusca. — 3. Klasse: Gastropoda. 341 
Cambrium 
Devon 
Steinkohlen- 
| Gegenwart 
Opisthobranchiata 
[ Actaeonella 
\Avellana ! | 
Prosobranchiata | 
Pleurotomaria N | 
Bellerophon E — | 
Turbo m I ee 
[See 
Nerita | | 
Neritina 
Ctenobranchiata 
Pieno- Straparollus el | 
se Solarium | 
9 l? Maclurea —|— | | | 
Turritella 
Capulus Zr a — : 
Nalica | neo loss |oac || 
Taenio- |Naticella : | 080 
glossa: )Naticopsis er — | —— || — 
Holosto- \Paludina 
mala Melania | | 
Melanopsis | 
Chemnitzia | | | 
Maerocheilus \— | — 5 
T.Entomo-|Nerinea | | en 
stoma  \Cerithium 
Rostellaria 
J Pterocera 
Alaria | = 
Aporrhais | | 
T. Canal. { Tritonium | | 
Bucceinum 
Rachio- |Voluta 
glossa )Fusus 
Murex | 
Toxo- J[Pleurotoma 
glossa \Conus 
Neurobranchiata 
{ Oyelostoma 
Pulmonata 
|Planorai | 
T. Alata 
Planorbis 
Helix (Zonites 
Clausilia | 
Pupa .. | | 
