[113] 



Art. III. — New Unionidce, Melanidce, etc., chiefly of the United States. 



By Isaac Lea. 



(Continued from page 65.) 



Ampullaria gracilis, pi. 22. fig. 1. 



Testa regulariter elliptica, luteo-olivacea, transversim pervittata, subtenui, arete umbilicata, Ifevi, nitida ; 

 spira emersa ; suturis parum impressis ; anfraetibus instar senis, subconvexis ; apertura ovata, 

 intus tenebroso-brunnea et obsolete vittata ; labro acuto ; umbilico arete compresso ; eolumella Itevi. 



Shell regularly elliptical, yellowish olive, transversely and very much banded, 

 rather thin, narrowly umbilicate, smooth and shining ; spire raised ; sutures slightly 

 impressed; whorls about six, somewhat convex; aperture ovate, dark brown and 

 obscurely banded within ; outer lip acute; umbilicus narrowly compressed; columella 

 smooth. 



Proc. Acad. Nat. Sci. 1856, p. 110. 



Eah. — Siam, S. R. House, M. D., per W. A. Haines. 



My cabinet and cabinet of Mr. Haines. 

 Diam. 1-22, Length 1-40 inches. 



Remarlcs. — I have two specimens of this beautiful species before me. The bands 

 are very much the same in both of them. The epidermis is very smooth and slightly 

 polished. It is near to flagellata, Say, from Cuba and Florida, but is smaller, rather 

 thinner and has a more constricted umbilicus. It differs also in having but little 

 matter deposited on the columella. 



Ampullaria turbinis. PI. 22, fig. 2. 



Testa turbinata, luteo-viridi, transversim vittata, subcrassa, vix perforata, IeevI ; spira valde depressa ; 

 suturis parum impressis; anfractibus instar quinis, valde convexis; apertura pergrandi, elongato- 

 ovata, intus fusca et valde vittata; labro acuto; columella valde incurvata, incrassata. • 



Shell turbinate, yellowish green, transversely banded, rather thick, scarcely per- 

 forate, smooth ; spire very much depressed ; sutures slightly impressed ; whorls about 

 five, very convex ; aperture very large, elongately ovate, brownish and much banded 

 within ; outer lip acute; columella very much incurved and thickened. 



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