314 AMERICAN JOURNAL 



70. P. Knoxvillense, Lea. Figs. 133. Subulate, smooth, 

 rather thin ; spire attenuately conical, sharp; suture impressed; 

 whorls 10, slightly convex, carinate towards the apex, the last 

 somewhat constricted. Pale horn-color. Knoxville, Tenn. 



71. P. Whitei, Lea. Fig. 134. Attenuately conical, smooth, 

 sornewhat thick ; spire much elevated ; suture impressed ; 

 whorls 9, slightly convex; aperture very small, broadly trun- 

 cately effused below. Dark horn-color, whitish within. La- 

 fayette Co., and Marietta, Oeo. ; Farland^s Creeh, Miss.; Tenn. 



72. P. attenuatum, Xea. Fig. 135. Subulate, smooth, 

 rather thin ; spire attenuate ; suture impressed ; whorls 9, 

 scarcely convex, the last small ; aperture small, rhomboidal, 

 broadly effused below, Horn-color, without bands. Lafay- 

 ette, Oeo.; Tenn. 



73. P. Estabrookii, Zea. Fig. 136. Attenuately conical, 

 smooth, rather thin ; spire much raised ; apex acute, carinate 

 or angulate just above the suture; last whorl slightly convex. 

 Horn-color, whitish within, without bands. E. Tenn. 



74. P. modestum, Lea. Fig. 137. Conical, smooth, rather 

 thin ; spire somewhat raised ; suture linear ; whorls 7, some- 

 what convex, the last somewhat compressed ; aperture small, 

 rhomboidal. Greenish horn-color, without bands, bluish-white 

 within. Blount Co., Tenn. 



75. P. luteum, Lea. Figs. 138, 139. Obtusely conical, 

 smooth, rather thick, sharp-pointed ; spire obtusely conical ; 

 suture impressed; whorls 8, somewhat convex; aperture 

 rather small, rhombic. Straw-color, without bands, within 

 whitish or brownish. ;S'. Carolina. 



Fig. 138 is typical ; Fig. 139 represents P. CaroUnense, Lea. 



76. P. curvatum, Lea. Fig. 140. Obtusely conical ; 

 spire elevated ; apex acute ; suture impressed ; whorls 8, con 

 vex, the last slightly canaliculate in the middle, aperture 

 small, curved. Dark horn-color, sometimes with a band near 

 the base. Tenn. 



77. P. simplex, Lea. Fig. 141. Conical, smooth, rather 

 thick; spire rather elevated; suture somewhat impressed; 

 whorls 8, somewhat convex, the last a little constricted ; aper 

 ture small, constricted, rhomboidal, with a short, narrow, re 

 curved sinus. Cincinnati., Ohio. 



78. P. bivittatum, Zm. Fig. 142. Conical, thick, smooth; 

 spire obtuse ; suture much impressed ; whorls 7, rather con 

 vex, the last large somewhat rhomboidal; aperture rathei 

 large, somewha^ attenuate below. Yellowish-green, with two 

 distant dark brown bands, whitish within. Tenn. 



