. The shell book . ngated, conical, regular; aperture with short canal;columella without callus. Tryon describes eighty-two species. The Ponderous Pleurocera (A. ponderosa, Say) is a heavycone of flat coils, the last one keeled. The short lip canalturns to the left. The surface is olive, the lining white. Length,2 inches. Habitat.— Tennessee. A. undulata, Say, has a handsome elevated spire of broadflat coils that cover a row of knobs, and so produce wavy foldsbelow the deep suture. The white lip projects. Length, ijinches. Habitat.— Ohio River. A. canaliculata, Say, is distinguished by its dis
. The shell book . ngated, conical, regular; aperture with short canal;columella without callus. Tryon describes eighty-two species. The Ponderous Pleurocera (A. ponderosa, Say) is a heavycone of flat coils, the last one keeled. The short lip canalturns to the left. The surface is olive, the lining white. Length,2 inches. Habitat.— Tennessee. A. undulata, Say, has a handsome elevated spire of broadflat coils that cover a row of knobs, and so produce wavy foldsbelow the deep suture. The white lip projects. Length, ijinches. Habitat.— Ohio River. A. canaliculata, Say, is distinguished by its distinctgroove on the body whorl. Variable in form and size and rangingin colour from pale green or yellow to black, yet it is is very common at the falls. Length, i inch. Habitat.— Ohio River. Genus GONIOBASIS, Lea Shell heavy, ovate or elongated; aperture angled in front,but without canal or notch. A large genus of one hundred andfifty species, one-half of the entire family, distributed east of 188.
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Keywords: ., bookcentury1900, bookdecade1900, bookidshellbook00r, bookyear1908
