of North Avfierioan Ildicidae. 435 



which I obtained is in the least liirsnte. (Trans. Anier. Phil. Sec, N. 

 S. IV., p. 108, PL Xy.,Jl(/s. 33-a. b. c.) 



Caracolla IlELrcoiDES. — T. orbiculata, fusca, supra pUino-convexa, 

 subtus iiitiata, imperforata, oblique striata; anfr, 5, spira obtusissiina ; 

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

 quorum inferior longus et laniinatus, superior parvus et coiiicus est; 

 columella dentem unicuni, longum, elevatum et iiicurvum habente. 

 Diara. Ifths. Length a^jtlis inch. 



JJab. — Tennessee, near Nashville. 



H. palliata? Say var. a. Acad. Nat. Soc. II., 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 PI. pal- 

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

 of the hirsute appearance of the j^'^^l^ota^ 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. l. c, 2>- 109, PL XV., figs. 34, a, b, c.) 



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

 Say published the following note : 



G. helicoides Lea, Trans. Am. Phil. Soc, IV. N. S., is var. a. of //. 

 palliata Say, II, denotata Fer. 



If. Carolinensis Ibid, corresponds by description and figures with H. 

 appressa Say, var. a. 



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

 Terr. Moll. (1851), places U. ohstricta and Lea's two species in 

 the synonym}' of H. palliata. W. G. Binney (Terr. Moll. lY., 

 1859) observes that tlie extreme variation of 11. palliata lias 

 given rise to considerable confusion. He designates 11. Caro- 

 linensis as "a prominent variety," but holds //. ohstricta to be 

 distinct, having no doubt of its identity with II. helicoides ', he 



