340 SHELLS AND SHELL-FISH. PART 11. 



Paludina Lam. Whorls inflated ; umbilicus open ; 

 operculum horny ; aperture ovately round, 

 elongata. Zool. 111. i. p\. 98. (Jiff. 101. b.) unicolor. lb. (c.) 



Nematura Benson.* Whorls slightly convex; aperture 

 small, oblique, contracted ; operculum spiral, horny. 

 Sow. Man. f. 305. 



Meladomus Sw. Spire pointed; aperture oval, re- 

 versed, pointed, and contracted above ; umbilicus 



none ; operculum } 



M. bulimoides. f Sw. Sp. Nov. 



SuB-FAM. MELANIAN^. 



Shell spiral ; the spire always as long as, and generally 

 much longer than, the aperture ; body-whorl small.;}: 



Paludomus Sw. Shell oblong-globose, strong; spire 

 shorter than the aperture ; inner lip very thick. 



Paludomus. Shell smooth ; outer lip slightly spreading, 

 the margin crenated ; inner lip very thick and ena- 

 meled. India. 



P. globulosa. GrifF. Cuv, xii. conica. GrifF. Cuv. f. 5. 

 pi. 14. f. 6. retiisa. lb. f. 9. 



Anculosa Say. Spire very short ; outer lip sinuated, 

 thin ; top of the inner lip thickened internally ; but 

 obsolete in the middle, and flat at the base. America. 

 pra^rosa and monodontoides Say. Sow. Man. 314. 



Hemimitra Sw. Resembling Paludomus ; but the 

 whorls are coronated. India. 



H. retusa. Sw. Sp. Nov. 



Melania. Shell elongated, spiral; the aperture oval, 

 entire ; the outer lip dilated at its base. 



• I do not know this type. 



+ Entirely brownish black. The shape and size similar to Bulimus 

 ciirinus ; but the outer lip thin. Inhabits China ? 



X Except in Paludomus, which blends into Melado?nus, and thus unites 

 this with the last sub-family. 



