50 



PROCEEDINGS OF THE ACADEMY OF 



Column 4, those of Mexico, excepting the west coast. 

 Column 5, those common to Mexico and the Atlantic region. 

 Column 6, those of Greenland. 



Class GASTEROPODA. 

 Order PECTINIBRANCHIATA. 



Suborder ROSTRIFERA. 



Family. 



Subfamily. Genus. 



AMPULLARIAD^E Ampullaria. . . 



CYCLOPHORID^I Cyclotinj! Cyclotus 



CYCLOPHORIN^.Cyclophorus. .. 



LiciNW.fi Ctenopoma.. . . 



CTCLOSTOMiN^i.Tudora 



Cistula 



Chondroperna. 

 HELICINIDiE Helicina 



Schazicheilae. . 



LITTORINTME Amnicola 



TRUNCATTELLID^: Truncatella. .. 



MELANIADiE Melania 



Gyrotoma 



Leptoxis 



Io 



VIVIPARIDJE Viriparus 



Bithinia 



VALVATmS Valvata 



Order SCUTIBRANCHIATA. 



Suborder PSEUDOBRANCHIA. 



PROSERPINAD,E Ceres. . . . 



Order PNEUMOBRANCH1ATA. 

 Suborder GEOPHILA. 



TESTACELLIDjE., 



ARIONIMS 



HfcLICIDJi 



VERONICELLID-E. 

 ONCHIDIADiM , 



.Glandina 



.Arion 



.Tebennophorus... . 



Limax 



A r itrina 



Simpulopsis. .. 



Succinea 



Helix 



Bulimus 



Spiraxis , 



Orthalicus 



Macroceramus. 



Achatina 



Pupa 



Vertigo 



Cylindrella 



.Veronicella 



.Onchidium 



Suborder LIMNOPHILA. 



ATJRICULIDJK Melampin^. . .Melamptw.. 



Acriculin^e. . .Alexia 



Blauneria.. 



Leuconia. . . 



Carychium. 

 LIMNEAD.E Limnaea 



Pompholyx . 



Physa 



Planorbis... 



Ancylua 





 

 

 

 

 

 

 

 

 2 

 1 

 9 

 

 3 

 10 

 4 

 

 



2 

 1 







1 

 

 o 

 4 

 20 

 S 

 



1 







1 





 

 

 



1 



1 





 

 

 



13 

 1 



10 



11 



4 



4 

 

 

 1 

 

 



1 



6 

 



18 



4 



292 



10 



54 

 



60 

 

 8 



6 



1* 

 2 

 3 

 1 

 

 15 

 111J 



"I 

 

 2 



1 

 3 

 12 

 4 

 4 

 1 



8 



1 



1 



1 



1 



45 







30 



31 



10 



117 770 I 11 177 



5 



1 

 2 





 1 

 1 

 2 

 22 

 3 

 

 1 

 4 

 

 

 

 1 

 



1 



16 

 

 

 



1 



3 



2 



31 



26 



17 



3 







5 











15 











Total 





 

 



It 

 1 







1 



2|| 























1 





 



I) 







17 13 1048 



9 



1 



2 



1 



1 



1 



3 



26 



3 



20 



5 



305 



10 



57 



10 



66 



1 



9 



22 



2 



2 



4 



3 



3 



22 



167 



48 



17 



4 



1 



9 



13 



4 



19 



1 



1 



9 

 1 



1 

 1 

 1 



61 

 1 

 41 

 44 

 14 



Imported. 



% Two species imported. 



t Found also In the Atlantie region, and imported. 

 I One species imported. 



[Feb. 



