102T.] Manipitr Molluscs. 6io 



GEOGRAPHICAL AND ECOLOGICAL DISTRIBUTION, 

 PLAvSTlClTY AND VARIATION. 



By N. Annandale. 



Geographical Distribution. 



It will be as well for me to begin this section of our paper 

 with a list of the species we have discussed. 



IJst of the Aquatic and Amphibious MoUusca of the Manipur Valley. 



GASTROPODA. 

 Order Pectinibranchiata. 

 Hydrobiidae. 



1. Amnicola (Alociniiia) orcnla (Fraueufeld). 



2. Digoniostoma pulchcllum (Benson). 



3. Digoniostoma textum, Annandale. 



Viviparidae. 



4. Vivipava crassispiralis, Annauda'e. 



5. Vivipara oxytropls (Benson). 



6. Vivipara micron, Annandale. 



7. Lccythoconcha lecythis (Benson). 



ilELANIIDAE. 



S. Mclanoidcs tubcrculaius (Miiller). 

 9. Acrostoma variabilis (Benson). 



10. Paludomus pit st ulosa , Annandale. 



Ampullariidae. 



11. Pachylabra niaura (Reeve). 



Order Pulmonata. 



SUCCINEIDAE. 



12. Succmea nUilans, Blanford. 



13. Succinea elegantior, Annandale. 



I.IMNAEIDAE. 



14. Limnaea actcmiiiata, Lamarck. 



15. Limnaea ovalis, Gray. 



16. Limnaea andersoniana, Nevill. 



17. Limnaea ovalior, Annandale and Prashad. 



