TABLE 
Families. 
1. Streptoneura 
ORDER 1. ASPIDOBRANCHIA 
A. Docoglossa 
B. Rhipidoglossa 
Haliotidae 
Pleurotomariidae 
Bellerophontidae 
Fissurellidae . 
Euomphalidae 
>. Stomatiidae 
Turbinidae 
Phasianellidae 
9, Delphinulidae 
Trochonematidae 
. Trochidae 
2. Umboniidae 
Neritopsidae . 
Neritidae 
pc 
ORDER 2. CTENOBRANCHIA 
A. Heteropoda . 
B. Platypoda 
1. Eulimidae 
Pyramidellidae 
Scalariidae 
Solariidae 
Purpurinidae . 
Littorinidae 
Cyclostomidae 
Capulidae 
Naticidae 
Xenophoridae 
Ampullariidae 
Valvatidae 
Viviparidae 
4, Amnicolidae 
5. Rissoidae 
. Turritellidae . 
. Vermetidae 
. Caecidae 
Melaniidae 
. Nerineidae 
oe CO DD 
Nr oH WMA D 
ee a a 
21. Cerithiidae 
22. Aporrhaidae 
. Strombidae 
. Columbellinidae 
SHOWING THE VERTICAL 
Cambrian. 
MOLLUSCA 
Ordovician, 
Silurian. 



Devonian. 


RANGE 
Carboniferous, 
SUB-KINGDOM VI 
OF THE GASTROPODA. 
Permian, 


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