102 OBSERVATIONS ON NAIADES, 



Shell acutely turrited, thin, horn-coloured ; apex acute ; whirls eight, carinate im- 

 mediately above the suture, longitudinally undulated and transversely lineated ; base 

 angulated ; aperture white, and one-fourth the length of the shell. 



Hab. Tennessee river, Professor Vanuxem. 



My Cabinet. 



Cabinet of Prof. Vanuxem. 



Diam. five-twentieths, Length thirteen-twentieths of an inch. 



Remarks. — I have seen no described species to which this bears a 

 close resemblance. Its delicate form, furnished with undulations and 

 transverse lines, will easily distinguish it. 



Helix Caroliniensis. Plate XV. fig. 33, a, b, c. 



Testa supra depressd, infra injlata, oblique striata, fused, imperforatd; anfracti- 

 bus quinque; spird maxime obtusu; aperturd coarctatd; labro albo, reflexo, latoque, 

 duobus dentibus instructo, quorum inferior longus et laminatus, superior parvus et 

 conicus est; columelld dentem levatum incurvumque habente; columellm basi valde 

 impressd. 



Shell depressed above, inflated below, obliquely striated, fuscous, imperforate ; 

 whirls five; spire very obtuse; aperture contracted; outer lip white, broad and re- 

 flected, furnished with two teeth, the inferior one long and lamellar, the superior 

 one small and conical ; columella with an elevated incurved tooth ; base of the co- 

 lumella much impressed. 



Hab. South Carolina near Cheraw. 



My Cabinet. 



Cabinet of Professor Vanuxem. 



Cabinet of the Academy of Natural Sciences of Philadelphia. 



Diam. fourteen-twentieths, Length seven-twentieths of an inch. 



Remarks. — I found a few specimens of this fine Helix while travel- 

 ling through South Carolina three years since. They were taken from 

 beneath the bark of an old tree. It is closely allied to Mr Say's pal- 



