OXYSTTLA, MEXICO, ETC. 113 



c. Streaks straight, or reduced to spots , aperture rather 

 short, oblique, longa, p. 126 



c 1 . Streaks straight or waved, generally rich blackish- 

 brown, with tawny ones intermingled boucardi, p. 128 

 c 2 . Streaks angulated or obsolete, two or three broken 

 spiral bands developed. uhdeana, p. 129 



c 3 . Solid, plicatulate, conic, mainly white, the varices 

 generally narrow, columella short, oblique, truncate 

 below. strebeli, p. 128 



O. PRINCEPS (Broderip). PI. 16, all figures; pi. 17, figs. 10-12 

 (varieties). 



Shell ovate-conic, rather wide, moderately solid ; growth stria3 

 inconspicuous. Nearly white or cream-tinted, with waved stripes 

 which are dilated into broad quadrate or irregular blotches along a 

 super-peripheral belt, each forking into several branches along the sub- 

 sutural zone, and bi- or trifurcate below, a girdle of small blotches 

 formed at angles in the stripes, encircling the middle of the base ; 

 dark varices few, rarely exceeding one or two on the whole shell. 

 Whorls 6^, convex, the apex obtuse, usually with a minute black tip. 

 Aperture ovate, quite oblique, white or showing angular streaks 

 within ; peristome not thickened, usually dark-edged ; columella 

 thin, white, straight or a little concave; parietal callus thin, dark 

 brown. 



Alt. 57, diam. 34, longest axis of aperture 31 mill. 

 Alt. 63, diam. 35, longest axis of aperture 33 mill. 

 Alt. 43, diam. 27, longest axis of aperture 25 mill. 

 Young (figs. 3, 4) with continuous or subcontinuous peripheral, 

 circum-umbilical and intermediate bands, and broad stripes above, 

 the earlier 3 whorls corneous, without markings. 



W. Mexico: Mazatlan (Reigen, Forrer), Presidio de Mazatlan 

 (Richardson); Tepee (Cooper); Tres Marias Islands (Forrer, Rich- 

 ardson); Colima (Rolle). E. Mexico : Papantla (Deppe); Misantla 

 (Salas); Rancho de la Lima and Rancho de Quilate, both near Mis- 

 antla (Dona Estefania); Playa Vicente, in dense oak-forest (Hoge); 

 Coafepec, above Jalapa (Strebel, form C); Almolonga, below Jalapa 

 (Hoge); Mirador (Strebel, form C); Callejones de Malibran, near 

 Vera Cruz, living on trunks of trees and on fences (Strebel, form A); 

 Cordova (Hoge); Atoyac, near Cordova (H. H. Smith); Vera Cruz 

 (Salle, Heilprin exped.). S. W. Mexico: Panistlahuaca and Ixtapa, 



