38 



Class GASTEROPODA. 



Order PECTINIBRANCHIATA. 



Suborder ROSTRIFERA. 



Family. Subfamily. Oenus. 



AMPULLARIlDiE Ampullaria- ■ ■ 



CYCLOPHORID.^i- • • -CTCLOTiNa- . . .Cyclotus 



CTCLOPHORiN^.-Cyclophorus- • 



LiciNiNiB. Ctenopoma.- • • 



CTCLOSTOMlNiB.- Tudora 



Cistula. 



Chondropoma- 

 HELICINID.*:. Helicina 



Schazieheila • • 



LITTORINH)^ Amnicola 



TRUNCATTELLID^. Truncatella ■ . 



MELANIID^ Melania. 



Gyrotoma 



Leptoxis 



Jo 



VIVIPARID^ .Viriparus 



Bithinia 



VALVATID-*; VaWata 



Order SCUTIBRANCHIATA. 

 Suborder PSEUDOBRANCHIA. 



PROSERPIXID^ Ceres 



Order PNEUMOBRANCHIATA. 



Suborder GEOPHILA. 



TESTACELLTD^. 



ARIONID^ 



HELICID^. 



VERONICELLID^. 

 ONCHIDIID^. 



Suborder LIMNOPHILA. 



AURICULID^. Melampin^- Melampus.- 



AuKicuilNiE. • Alexia 



Blauneria • 

 Leueonia • ■ 

 Carychium 



LIMNJEID^ Limnjea.- - • 



Pompholyx ■ 



Pliysa 



Planorbis • • • 

 Ancylus ■ - • ■ 



• Glandina. 



• Arion 



•Tebennophorus 



Limax 



Vitrina 



Simpulopsis.- ■ ■ 



Succinea 



Helix 



Bulimus 



Spiraxis. 



Orthalicus 



Macroceramus.- • • 



Achatina.- • 



Pupa. 



Vertigo 



Cylindrella. 

 •Veronicella. 

 •Onchidium- 



* Imported. 



X Two species imported. 



t Found also in the Atlantic region, and imported. 

 H One species imported. 



[Feb. 



