138 OXYSTYLA, SOUTH AMERICAN. 



a cold, faint flesh-tint on the last whorl, with three more or less 

 noticeable spiral bands, the median one most persistent, narrow, and 

 nearly continuous, the others wider, fainter, and often discontinuous 

 or obsolete ; longitudinally marked with light purple or bluish-brown 

 undulating stripes, frequently mingled with narrower straight brown- 

 ish ones in the direction of growth-striae, or entirely without stripes ; 

 varices narrow and rather numerous, often three or four on the last 

 whorl. Apex generally with a minute brown dot. Whorls 6 to 7. 



Aperture ovate, purplish-flesh-tinted inside, showing the external 

 markings; parietal callus thin, light chestnut, with paler streaks; 

 peristome simple, narrowly dark edged. 



Alt. 48, diam. 29, longest axis of aperture 29 mill. 



Alt. 44, diam. 26, longest axis of aperture 26 mill. 



Alt. 67.8, diam. 40, longest axis of aperture 36.4 mill. 



Venezuela: Maracaibo (Gruner, C. F. Penny); Barcelona (C. 

 Blume) ; /. of Margarita (Couthouy); near the Lake of Valencia 

 (Moritz); Caracas (Lansberg); Angostura, on the Orinoco (Gruner). 

 Colombia : Region of the lower part of the R. Maydalena, in holes in 

 tree-trunks, not higher than six feet above the ground (Wallis); 

 Barranguilla (Swift), Santa Marta (Grosskopf); Rio de la Haclia 

 (Wessel, Swift); Savana Grande at Santa Marta and Valley Cosai 

 (Sievers); Sierra Nevada, on the trunks of Hecastophyllum dubium 

 (family Papilionaceae), and at Urumita in the Cordillera de Los 

 Andes (Sievers). Ecuador: San Juan de la Cosia (Reiss). Peru: 

 Maranon R. (Warschewitz). 



Typical form. 



Orthalicus maracaibensis PFR., Malak. Blatt. iii, p. 186 (1856); 

 Monogr. iv, p. 588. MARTENS, Binnenmoll. Venezuela's p. 32, in 

 Festschrift zur Feier des 100-jalirigen Bestehens der Gesell. Natur- 

 forsch. Freunde zu Berlin, p. 188, pi. 1, f. 7 (1873). STREBEL, 

 Beitr. Mex. Land- und Siisswasser-Conch. v, p. 27, pi. 3, f. 8 a, I), c. 

 Orthalicus ferussaci v. MARTENS, Binnenmoll. Venez., p. 32 (188), 



pi. 1, f. 6 Ortalichus ferussaci v. MARTENS in pa>rt (all South 



American localities and references), Biologia Centrali-Americana, 

 Moll., p. 184. Orthalicus ferussaci forms A and C, STREBEL, Beitr. 

 Mex. Land- und Siisswasser-Conch. v. pp. 18-21, 23, 24, pi. 2, f. 4 

 a, 5, 5 a, 6 a-d, 7, 9 or, b, 8 (shell), pi. 10, f. 2, 6, 17, pi. 12, f. 4, 5 

 (anatomy). ? 0. princeps form E, STREBEL, t. c., p. 16, pi. 3, f. 2, 



