96 NEW-YORK FAUNA MOLLUSCA. 



M. congesta. (Id. Am. Jour. Vol. 25, p. 343.) Shell subulate, with about nine volutions, the 

 lower ones obscurely angulated, those of the spire acutely carinate towards the apex: suture 

 well defined ; body-whorl obscurely angulated ; aperture longitudinally elliptical. Alabama. 



M. elevata. (Say, Ac. Sc. Vol. 2, p. 176. M. elongata? Lea, Am. Tr. Vol. 4.) Shell gradually 

 attenuating to the apex, slightly and irregularly wrinkled ; suture not deeply impressed. 

 Whorls 9 - 10, with several more or less elevated revolving lines, of which one being more 

 conspicuous, gives the shell a carinated appearance. Aperture oblique, equalling the length 

 of the 2d, 3d and 4th volutions together. Color, olivaceous. Length, 1*0; breadth, - 4. 

 Ohio river. 



M. ezcurata. (Conrad, Fr. Wat. p. 49, pi. 4, fig. 6.) Shell subulate, with a spiral band of slightly 

 oblique subcompressed tubercles on the base of the inferior whorls : above this, a prominent 

 line with a slight intervening channel. Whorls towards the apex nearly entire : base with 3 

 prominent lines ; the upper ones largest ; the third hardly prominent, and approximating to 

 the middle one. Color : epidermis reddish brown or black. Alabama. 



M.? integra. (Say, Des. ten. and fl. shells, p. 18.) Subglobose. Whorls 3, rounded, obsoletely 

 wrinkled ; spire very short, less than half the length of the aperture ; suture rather deeply 

 impressed; body-whorl large; aperture dilated, ovate, acute above; columella flattened, 

 polished ; lip regularly rounded ; base rounded, without undulation or sinus ; umbilicus none ; 

 opercle obviously spiral. Length, - 2. Ohio river. 



M. teres. (Lea, Tr. Am. Phil. Soc. Vol. 8, p. 176. pi. 5, fig. 27.) Shell plicate or folded, acutely 

 turreted, thin : spire drawn out ; sutures impressed ; whorls 9, convex ; aperture small, ellip- 

 tical. Color, horn; white within. Length, 0"87; diameter, - 25. Tennessee. 



M. obtusa. (Id. lb. pi. 5, fig. 28.) Shell folded, fusiform, rather thick : spire obtuse ; sutures 

 impressed; whorls 4, the last semiplicate ; aperture large. Length, 0"55; diameter, 0*27. 

 Tennessee. 



M. lecontiana. (Id. lb. p. 177, pi. 5, fig. 29.) Shell folded, conical, thick : spire obtusely ele- 

 vated ; sutures small. Whorls 6, flattened ; lower half of body-whorl not folded : aperture 

 large, nearly one-half of total length, elliptical. Length, 0"8; diameter, 0' 35. Georgia. 



M. rugosa. (Id. lb. pi. 5, fig. 30.) Shell folded, conical, rather thin, translucent, transversely 

 striated: spire rather elevated; sutures much impressed ; whorls seven, convex, cancellated 

 above; aperture rather large, elliptical, angular below. Color, horn. Length, - 5; diame- 

 ter, - 22. Teiuiessee. 



M. monozonalis. (Id. lb. pi. 6, fig. 31.) Shell folded, fusiform, rather thick : spire obtuse ; su- 

 tures linear; whorls 5, rather convex; aperture large, about one-half the total length, ellip- 

 tical. Color, light-colored, with a simple broad band on the upper part. Length, 0*42; 

 diameter, 0*21. Tennessee. 



M. terebralis. (Id. lb. p. 178, pi. 6, fig. 32.) Shell folded, acutely turreted, rather thin, shining: 

 spire much elevated ; sutures much impressed ; whorls 9, convex, carinate above ; aperture 

 small, about one-fifth of the total length. Color, reddish brown. Length, - 67; diameter, 

 • 24. Tennessee. 



M. columella. (Id. lb. p. 179, pi. 6, fig. 33.) Shell obscurely folded, conoidal, rather thin: 

 spire rather elevated, striate above ; suture impressed ; whorls six, somewhat compressed ; 



