96 NEW-YORK FAUNA — MOLLUSCA. 
M. congesta. (Ip. 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, 0°4. 
Ohio river. 
M. excurata. (Conran, Fr. Wat. p. 49, pl. 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. terr. 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, 0°2. Ohzo river. 
M. teres. (Lea, Tr. Am. Phil. Soc. Vol. 8, p. 176. pl. 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, 0°25. Tennessee. 
M. obtusa. (Iv. Ib. pl. 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. (Iv. Ib. p. 177, pl. 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. (Ip. Ib. pl. 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, 0:5; diame- 
ter, 0°22. Tennessee. 
M. monozonalis. (Ip. Ib. pl. 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. (Ip. Ib. p. 178, pl. 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, 0°67; diameter, 
0°24. Tennessee. 
M. columella. (Ip. Ib. p. 179, pl. 6, fig. 33.) Shell obscurely folded, conoidal, rather thin: 
spire rather elevated, striate above ; suture impressed; whorls six, somewhat compressed ; 
