PLANORBID^E. — MELAMPID2E. 97 



PLANORBIS.— Guettard. 



PLANORBI'S LENT US. — Say. 

 Plate XIV. Fig. 14. 



Planorbis lentus, Say, Amn. Conch., pi. 4, fig. 1. 



Planorbis lentus, Ravenel, Cat. Coll. Shells, p. 11. 



Planorbis lentus, Gould, Invert. Mass., p. 202, fig. 132. 



Planorbis lentus, De Kay, Zool. New- York, p. 60, pi. 5, fig. 80, a. b. 



Planorbis lentus, L. R. Gibbes, Tuomey's Geol. So. Ca., appendix, p. xix. 



Planorbis lentus, Stimpson, Shells of New-England, p. 51. 



Helisoma lentus, H. $■ A. Adams, Gen. Mollusca, Vol. 2, p. 262. 



Description. " Shell dull brownish or yellowish brown, sub-carinate above, particu- 

 larly in the young shell ; whorls nearly five ; striate across, with five raised, sub-equidis- 

 tant lines, forming grooves between them; spire concave; aperture large, embracing a 

 large portion of the penultimate volution; labrum more acutely, but not very prominently, 

 arquated above, its basal portion horizontally sub-rectilinear in the adult, and not extend- 

 ing below the level of the base." — Say. 



A very imperfect shell was found at Mr. Simmons'. 



Plate XIV. Fig. 14, Natural size, imperfect specimen. 



Locality. Simmons'. Museum, College of Charleston; Cabinet F. S. H. 



MELAMPUS.— Montfort. 



MELAMPUS BIDENTATUS. — Say. 



Plate XIV. Figs. 15, 15a. 



Melampus bidentatus, Say, Jour. Acad. Nat. Sci., Vol. 2, p. 245. 

 Auricula bidentata, Gould, Invert. Mass., p. 197, fig. 130. 



Auricula bidentata, De Kay, Zool. New-York, Art. Moll., p. 57, pi. v, figs. 92. 

 Auricula bidentata, L. R. Gibbes, Tuomey's Geol. So. Ca., appendix, p. xix. 

 Melampus corneus, Stimpson, Shells of New-England, p. 51. 

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