FAMILY TURBINID.E ANCULOTUS. 103 



A. plicatus. (Id. lb. pi. 8, fig. 18.) Suboval with a short spire, of which one whorl only is entire, 

 rounded : body-whorl slightly ventricose, with oblique plaits, which are crenulated on the margins 

 of a slight spiral groove near the suture ; aperture elliptical. Color, greenish or blackish, with 

 spiral bands. Alabama. 



A. pictus. (Id. lb. pi. 62. Am. Jour. Vol. 25, p. 342, pi. 1, fig. 15.) Suboval; shoulder obtusely 

 rounded; aperture obovate, large ; columella callous above. Color, olive, with numerous quadran- 

 gular small spots disposed in revolving lines, strongly marking the aperture. Length, • 5 ; dia- 

 meter, 0*35. Alabama River. 



A. proerosus. (Say, Ac. Sc. Vol. 2, p. 177. Conrad, 1. c. pi. 8, fig. 13.) Subglobose, oval: whorls 

 3-4, wrinkled across ; spire very short, much eroded, sometimes scarcely prominent above the 

 body-whorl, which is large, ventricose, with a very obtuse revolving band ; aperture suboval, above 

 acute, effuse ; base of the columella elongated and incurved, meeting the exterior lip at an angle. 

 Color, brownish ; a few revolving purplish dots within, sometimes obsolete. Length, • 8. Ohio. 



A. pumilus. (Conrad, Op. cit. p. 62.) Very small, obliquely oval: spire consisting of one entire 

 convex whorl ; apex eroded ; body-whorl regularly convex ; base with a groove behind the colu- 

 mella; aperture patulous, suborbicular. Color, blackish. Alabama. 



A. subglobosus. (Say, Ac. Sc. Vol.5, 128. Conrad, pi. 8, fig. 14.) Subglobose: spire but little 

 elevated, not half the length of the aperture ; whorls about four ; aperture rounded, nearly as 

 broad as long ; pillar-lip somewhat flattened. Color, brownish horn ; aperture more or less tinged 

 with red. Length, 0-6; diameter, # 5. Virginia. 



A. tceniatus. (Id. loc. cit. p. 63.) Shell oval or oblong: one whorl of the spire not eroded, often 

 longitudinally produced. Color, olivaceous, with dark green spiral bands: four on the body- 

 whorl. Length, 0*7. Alabama. 



Genus Io, Lea. Shell fusiform ; base canaliculate ; spire elevated ; columella smooth and concave. 



Io fusiformis. (Lea, Trans. Am. Phil. Soc. Vol. 4, p. 122, pi. 15, fig. 37. a. b. Fusus fiuviatilis, 

 Say, Jour. Acad. Nat. Sciences, Vol. 5, p. 129.) Shell fusiform: spire much elevated, gradually 

 tapering ; volutions nearly six, wrinkled across, and with a series of elevated undulations on the 

 middle ; suture merely an impressed line ; aperture somewhat fusiform ; lip within the edge, undu- 

 lated ; canal rounded at tip ; columella very concave. Color, olive green or brownish, with more 

 or less dull reddish lines of the same, confluent. Length, 1-8; diameter, 0-9. Salt streams in 

 the interior of Virginia. 



