INDEX. 



Ammonites, 16 



Ammonites proper, 16 

 Planites, 16 

 Ceratites, 16 

 Orbulites, 16 

 Scaphites, 16 

 Baculites, 16 

 Hamites, 16 

 Turrilites, 16 

 Camerines, 17 



Siderolithes, 17 



Helicostega, 18 



Helicostega nautiloidea, 18 

 Helicostega ammonoida, 18 

 Helicostega turbinoida, 18 



Stycostega, 18 



Enallostega, 19 



Agathistega, 19 



Entomostega, 19 



CLASS II. PTEROPODA. 



Clio, 20 

 Cymbulia, 20 

 Pneumodermon, 20 

 Limacina, 20 

 Hyalea, 20 

 Cleodora, 21 



Cleodora proper, 22 



Creseis, 22 



Cuvieria, 22 



Psyche, 22 



Eurybia, 22 

 Pyrgo, 22 



CLASS III. GASTEROPODA. 

 ORDEH I. PULMONEA, 27 



Pulmonea Ter restrict. 

 Limax, 29 



Li max proper, 29 

 Anon, 31 

 Lima, 32 

 Vaginulus, 32 

 Testacella, 33 

 Parmacella, 33 

 Helix, 33 



Helix proper, 33 

 Vitrina, 34 

 Bulimus, 34 



Bulimus proper, 34 



