AMPULLARIA sordida, 

 Brown Apple Snail, /.I. 2. 



Generic Character. — See PI. 103. 



Specific Character. 



A. testd globosd, fernigined, lineis transversi.s subcurinatis instructd 

 aperfurce margine tentii ; umhilko niagno ; operculo corneo ? 



Shell globose, ferruginous, with obsolete transverse subcarinated 

 lines; margin of the aperture thin; unnbilicus large; operculum 

 horny ? 



Ihe only species of Ampullaria with which this may be 

 confounded is A.fasciata, p. 103, in comparison with which 

 it is a more globose shell, the aperture narrower, and the 

 spire more obtuse ; the umbilicus is larger, round, and not 

 contracted; the suture is not sunk, the shell is not banded 

 with coloured lines, nor is the surface smooth ; on the con- 

 trary, it is marked with transverse, obscurely carinated lines ; 

 while the shell is uniform brown, the aperture within is white, 

 margined with brown. 



AMPULLARIA puncticulata, 

 \ Oval, punctured /Jppk Snail,/. 3. 4. 



A. tentd oxatd, subtilissime punctata ; spird obtusd ; lahii exterior'ts 

 margine, infer/ori.sqiie basi riijis, incrassatis ; operculo corneo ? 



Shell oval, minutely punctured, spire obtuse; margin of the ex- 

 terior lip within, and base of the inner lip thick and rufous ; 

 operculum hornv? 



1 His and A. ohloriga are the only species I am yet ac- 

 quainted with, whose form is not globose. It never grows 

 to a size much larger than the figure ; the whole shell is 

 marked by fine longitudinal striae, and transverse lines of 

 minute dots, discernible only by the aid of a common 

 magnifier; the aperture within is brovv'iiish flesli-colour ; 

 the margin is strong and reddish, and, within that of the 

 outer lip, is a thickened rim; which, should the operculum 

 be testaceous, may supply the place of the groove for it;^ 

 reception observable in A. ghbosa and corrugata. The 

 localities of both these species are unknown to mo. 



PI. 143. 



