INDEX. 



Synonyms, and the names of such proposed species as have not 

 yet been recognised from the characters indicated, are printed in 

 italics. 



Acella, p. 14. . . Limnea, p. 6 



Amphipepiea, . ; "3, 14 



Ancylus crassus, ... 14 



depressus, ... 6 



diaphanus, ... 8 



filosus, .... 10 



fuscus 12 



obscurus, .... 9 

 parallelus, ... 11 

 rivularis, .... 4 

 tardus, .... 7 



Aplexa, 14, 37 



Buccinum, . . . Limnea, 1 

 Buliranea, .... " 6 

 Bidivms, .... Physa, 23 



Bulinus, " 23 



Bulla crassula, Dillw. " 23 



fontiiialis,Chemx\. "23,29 



Jluviatilis, Planorbis, 13 



hypnorum, . Physa, 36 



Crepidula, . . Ancylus, 1 



Diastropha, 14 



Helix, Limnea, 1 



angulatus, Planorbis, 6 



Leptolimnea, . . . Limnea, 1 



Limnea, .... Physa, 1 



Limnea acuminata, ... 38 



apicina, .... 37 



appressa, .... 18 



attenuata, ... 28 



bulimoides, ... 44 



caperata, .... 34 



catascopium, . 6, 52 



Am. P. 



Limnea casta, Proc. Am. P, 



S. ii. . 

 coarctata, 

 columella, 

 chalybca, 

 curta, Proc 



S.ii. . 

 decollata, 

 desidiosa, 

 desidiosa, 

 distortus, 

 elodes, . 

 emarginata, . . 

 exigua, Proc. Am. P 



S. ii 



exilis, 26 



expansa, .... 29 

 ferrug:inea, ... 49 

 fragilis, ... 20, 23 

 fusiformis, Proc. Am. 



P. S.ii 33 



galbana, .... 51 

 gracilis, .... 50 

 griffithiana, Proc. Am. 



P. S. ii 33 



heterostropha, Physa, 23 

 humilis, .... 41 

 jugularis, .... 16 

 kirtlandiana. Proc. 



Am. P. S. ii. . , 

 macrostovia, . . , 

 megasoma, . . , 

 modicella, . . . 



33 

 38 

 13 

 41 



