See Lam. Sys. 6, 2, p. 163.—Dubois Trans. 193.
Specific Character.
Shell ovate-conical, blackish, upper part of the whorls armed with solid porrect spines; aperture bluish white.
M. amarula. Lam. Sys. 6, 2, p. 166. Chemn. pl. 134, f. 1218-9. Ency. pl. 468, f. 6.
This is a genus of fresh water shells, particularly abundant in Africa, Asia, and America; we have also heard it has lately been detected in Europe.
We should not have figured this common and well known shell, but for the purpose of comparing it with the next. When in a young state, the spines are very acute: more advanced they become less so; and in old individuals they are often very obtuse.
MELANIA setosa.