AMPULLARIA corrugata, 

 Wiiiikled Apple Snail. 



Generic Character. — See PI. 103. 



Specific Character. 



A, testd globosd, corrugatd, olivaccu ; spirce prominent is, acutce, an- 

 fractibus ventricosis ; aperturce margine crasso, fuho, sulcato ; 

 unibilico parvo, juxta labii interioris mediam posito ; operculo 

 testaceo. 



Shell globose, wrinkled, olive ; spire prominent, acute, the whorls 

 ventricose; margin of the aperture thick, fulvous, grooved; 

 umbilicus small, Unear, near the middle of the inner lip; 

 operculum shelly. 



Helix AmpuUacea. Linn. Gmelin, p. 3626. 



AmpuUaria rugosa. Sowerby, Genera of Shells, fas. A. fig. 1.2. 



The annexed figures of this hitherto undefined species will 

 clearly show its distinction from Amp. ghbosa, (pi. 119); 

 and the specific characters now framed for these two shells, 

 will, I think, sufficiently distinguish them from each other. 



In comparison with J. globosa^ this (even in the young 

 state) is a wrinkled, not a smooth shell, having the umbilicus 

 placed near the middle, not towards the base, of the inner 

 lip : the spiral whorls are elevated and ventricose, not de- 

 pressed, and slightly convex ; and the basal volution, instead 

 of being very wide on the upper part, (near the suture,) is 

 widest only in the middle. In young shells, the wrinkles 

 and the marginated aperture are less defined. When divested 

 of its epidermis, the colour is blueish white, with a few 

 narrow bands of obscure purple. A specimen in my own 

 collection has the epidermis so thin, that the colours beneath 

 it are very conspicuous. The mouth inside is dark chesnut, 

 with blackish bands ; the margin being pale yellow and 

 slightly reflected. The umbilicus, both in this and in 

 A. globosa, is small and contracted, while in the real A. 

 rugosa Lam. {Helix urceiis Lin.) it is very large, round, and 

 deep. This latter shell, also, differs from both of the former, 

 by having a thin, and not a margined aperture. 



Mr. Sowerby appears the only writer who has figured this 

 shell, which he has mistaken for the A. rugosa of Lamarck. 

 I am informed by Mr. Humphreys it is a native of India. 



PI. 120. 



