312 AMERICAN JOURNAL 



56. P. neglectum, Anth. Fig. 112. Elevated, conical, 

 rather thin; whorls 10, the upper ones nearly flat, with a slight 

 ridge just above the suture; the ridge disappears towards the 

 penultimate whorl, but two of them become visible on the 

 last whorl, which is sub-angulate. Light yellow or greenish, 

 with two dark brown bands. Great Miami River, Ohio. 



57. P. vestitum, Conr. Figs. 113, 114. Awl-shaped, 

 smooth, thin, diaphanous; spire long, pointed; suture slightly 

 impressed; whorls 9, flattened above, and somewhat carinate; 

 aperture rather small, ovately rhombic, produced below. 

 Straw-yellow, with sometimes a brown band inferiorly. N. 

 Ala. 



Fig. 113 is typical, Fig. 114 is mucronata, Lea. 



57a. P. lugubre, i>ea. Figs. 115, 116. Pyramidal, smooth, 

 somewhat thick ; spire somewhat elevated ; suture slightly im- 

 pressd; whorls 8, flattened; aperture small, broad at the laase. 

 Dark brown, white within. Ala. 



58. P. strigosum, Lea. Fig. 117. Acutely turrited, 

 smooth, thin, striate above; spire drawn out; suture im- 

 pressed; whorls 9, flattened ; aperture small, elliptical, angu- 

 lar at the base. Pale yellow, bluish within. Holston River, 

 Tenn. 



58a. P. pictum, Lea. Fig. 118. Obtusely conical, sub- 

 fusiform, thick ; spire elevated, conical, carinate above; suture 

 impressed, furrowed above; whorls 8, flattened; aperture 

 elongated, trapezoidal; columella incurved; base of aperture 

 angular, with rather a large sinus. Greenish-yellow, lighter 

 below the suture, three-banded. Holston River, Tenn. 



58b. P. spinalis, Lea. Fig. 119. Acutely conical, cari- 

 nate, rather thin; spire elevated; suture excavated; whorls 

 10, flattened, angulate just above the suture ; aperture small, 

 ovate, angular at base. Bright yellow, double-banded. Ala. 



59. P. tenebrocinctum, Anth. Figs. 120, 121. Ovate- 

 conic, smooth, rather thick; spire obtusely elevated; whorls 

 6 — 8, nearly flat, obtusely carinate above the suture ; aperture 

 small, rhomboidal. Yellowish horn-color, with two bands or 

 without bands, whitish within. E. Tenn. 



Fig. 120 is typical ; Fig. 121 is P. parvum, Lea, an older individual. 



60. P. Vanuxemii, Lea. Fig. 122. Conical, smooth; 

 spire elevated ; suture impressed ; whorls 6, somewhat convex; 

 aperture rather small, with a short, wide fuse. Yellowish, 

 with or without two bands, white within. S. Carolina. 



61. P. Chakasahaense, Lea. Fig. 123. Conical, smooth, 

 rather thin ; spire attenuate ; suture much impressed ; whorls 

 8,* convex, carinate above ; aperture small, rhomboidal. 

 Brownish-green, double-banded. Chahasaha River, Ala. 



