PLEKOCHEILUS-EURYTUS. 89 



a. Surface spirally striated. 



b. Light, with brown dots and spots, spire rather long, 



piperitus. 



bb. Dark chestnut, solid, spire short, super striatus. 



aa. Surface irregularly granulate. 



b. Yellowish with brown dots, pseudopiperatus. 



bb. Chestnut-brown, markings indistinct, taylorianus. 



P. PIPERITUS Sowerby. PI. 36, fig. 77. 



Shell imperforate, ovate-acuminate, thin but rather solid ; color a 

 light brown tint, irregularly and finely speckled and spotted with 

 chestnut throughout. Surface lusterless, smoothish, under a lens 

 showing close, irregular growth-wrinkles cut by numerous more spaced 

 spirals. Spire regularly conic. Whorls 5, the last rather com- 

 pressed above, sack-like below, suddenly dejiexed and flattened behind 

 posterior angle of aperture. Aperture ovate, bluish and with some 

 spots within ; peristome white, a trifle thickened, not noticeably 

 expanded ; columella concave, narrow, slightly widening at insertion 

 where it is reflexed and adnate ; parietal callus thin and transpar- 

 ent. Alt. 44, diam. 25 ; aperture, alt. 24 mill. 



Huallaga, Peru. 



Bulinus piperitus Sows., Conch. Illustr., f. 93. Bulimiis piperi- 

 tus REEVE, Conch. Syst., ii, pi. 174, f. 93; Conch. Icon., pi. 16, f. 

 96. PFR., Monogr., ii, p. 17. 



P. PSEUDOPIPERATUS Moricand. PI. 35, fig. 76. 



Shell ovate, imperforate, solid, inflated ; covered with a yellowish 

 epidermis, with scattered brown dots. Spire rather short, acumin- 

 ate; suture impressed. Whorls 5 to 5?, rapidly enlarging, convex, 

 the last large, deeply descending, f the length of shell, rugose-gran- 

 ulate and irregularly striated. Aperture ample, oblong-oval ; lip 

 simple, not reflexed, white ; columella reflexed, straight, calloused ; 

 inside shining, with a pearly sheen. (J/on'c.). Alt. 60, diam. 30 

 mill. 



Moyobamba t Peru. 



B. pseudopiperatus MORIC., Rev. et Mag. de Zool. (2) x, 1858, p. 

 451, pi. 14, f. 2 (Oct., 1858). PFR., Monogr., vi, p. 88. 



Moricand's figure measures alt. 60, diam. 31 mill., differing con- 

 siderably from the dimensions in his text, which are, alt. 40, diam. 

 30 mill., probably by typographical error. 



