112 ReTnavhs on Certain Species ^ 



wliich I obtained is in the least hirsute. [Trans. Amer. Phil. Soc, N. 

 S. IV., p. 108, PL XV., Jiffs. 33-a. b. c.) 



Caracolla Helicoides. — T. orbiculata, fusca, supra plano-convexa, 

 subtus inflata, imperforata, oblique striata ; anfr. 5, spira obtusissima ; 

 apertura contracta ; labro albo, lato et reflexo, dentibus duobus instructo, 

 quorum inferior longus et laminatus, superior parvus et conicus est ; 

 columella dentem unicum, longum, elevatum et incurvum habente. 

 Diam. |fths. Length g^ths inch. 



Hab. — Tennessee, near Nashville. 



H. palliata? Say var. a. Acad. Nat. Soc. 1\., p. 152. 



Shell orbicular, fuscous, plano-convex above, inflated below, imperforate, 

 obliquely striated ; whorls 5 ; spire very obtuse ; aperture contracted ; 

 outer lip white, broad, and reflected, furnished with two teeth, the infe- 

 rior one long and lamellar, the superior one small and conical ; colu- 

 mella with a long, elevated, incurved tooth. 



Remarks. — Among the fine shells brought by Prof. Vanuxem, some 

 years since, from a tour through the Western States, were two specimens 

 of this beautiful Caracolla. In its specific characters it resembles H. pal- 

 liata Say, and S. Carolinensis described in this paper. It is destitute 

 of the hirsute appearance of the ji^a^Ziata, and is entirely distinct in the 

 flatness of the whorls of the spire. In the Carolinensis the base of the 

 columella is more impressed, and the whorls more inflated. [Trans. 

 Amer. Phil. Soc. I. c, p. 109, PI. XY..,Jigs. 34, a, b, c.) 



On the cover of No. 6, of his American Conchologj (1834), 

 Say published the following note : 



C. helicoides Lea, Trans. Am. Phil. Soc, IV. N. S., is var. «. of II. 

 palliata Say, ff. denotata Fer. 



JI. Cai'olinensis Ibid, corresponds by description and figures with H. 

 appressa Say, var. a. 



Dr. Binney, in the Boston Journal (1840), and also in the 

 Terr. Moll. (1851), places II. obstricta and Lea's two species in 

 the synonymy of II. palliata. W. G. Binney (Terr. Moll. lY., 

 1859) observes that the extreme variation of H. palliata has 

 given rise to considerable confusion. He designates H. Caro- 

 linensis as " a prominent variety," but holds H. obstricta to be 

 distinct, having no doubt of its identity with H. helicoides / he 



