34>0 SHELLS AND SHELL-FISH. PART II. 



Paludina Lam. Whorls inflated ; umbilicus open ; 

 operculum horny ; aperture ovately round, 

 elongata. Zool. 111. i. pi. 98. (fig. 101. 6.) unicolor. Ib. (c.) 



JVematura 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.E. 



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

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



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. retusa. Ib. 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, 

 praerosa 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. 



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

 citrinus ; but the outer lip thin. Inhabits China ? 



I Except in Paludomus. which blends into Meladomus. and thus unites 

 this with the last sub-family. 



