Pl. 9.
AMPULLARIA Pl. 1.
A. carinata.
AMPULLARIA carinata.
Carinated Apple-snail.
Family Ampullaridæ.—Guild.
Generic Character.
Pachystoma. Shell ventricose; margin of the lip thick, generally grooved; operculum testaceous. Zool. Journ. 12. p. 536.
Specific Character.