4.? 



but high and scarcely truncate ; posteriorly long but much lower, 

 somewhat tapering to a well rounded extremity ; beaks wide, not 

 prominent ; cardinal teeth small and lamellar ; lateral teeth mode- 

 rately developed, not remote. 



Length .083 inch ; height .075 inch : breadth .05 inch. 



Catalogue of Fresh Water Shells, which inhabit Jamaica 

 By C. B. Adams. October, 1849. 



1. MELANOPSIS lineolata Gray. 



2. IVtELANIA spinifera Ad. 



3. VALVATA pygmsa Ad. 



4. PALUDZNA rivularis Ad. 



5. " Jamaicensis Ad. 



6. AHaPULAHZA fasciata (?) Lam. 



7. PI.ANOIIBZS MacNabianus Ad. 



8. " Redfieldi Ad. 



9. " Haldemani Ad. 



10. " dentiferus Ad. 



11. " pallidus Ad. 



12. " decipiens Ad. 



13. " affinis Ad. 



14. ANCYLUS obscurus(?) Hald. 



15. PHYSA Soverbyana Orb. 



16. lillVENAEA umbilicata Ad. 



17. CYCLAS pygmaja Ad. 



18. " Veatleyi Ad. 



Remarks on the distribution of the terrestrial and fresh-water 

 MoLLUscA which inhabit Jamaica. By C. B. Adams. October, 

 1849. Read before the American Association for the Promotion 

 of Science, August 16, 1849. 



In the following statements perfect accuracy in the details is not 

 attempted. Subsequent explorations will enlarge the total number 

 of known species, and modify our views of the distribution of spe- 

 cies, both by the discovery of new species whose distribution is very 



