DRYM^US, SOUTH AMERICAN. 277 



Has the general appearance of a young B. lobbii, but is from a 

 different region. 



D. OREADES (Orbigny). PL 44, figs. 95, 96. 



Shell perforate, oblong-conic, thin and fragile. Flesh colored or 

 light yellow, with irregularly spaced purplish-brown longitudinal 

 streaks, which abruptly cease a little way below the periphery, leav- 

 ing the base immaculate; the streaks often a little spreading at the 

 suture, frequently converging gable-like there. Surface rather 

 glossy, smooth, showing under the lens fine, close spiral striae. Spire 

 conic, the lateral outlines a trifle convex ; apex obtuse; whorls 6}- 

 8, but slightly convex, the sutures shallow, bordered by a white 

 line. 



Aperture less than half the shell's length, ovate, slightly oblique, 

 the upper half chestnut, streaked within ; peristome thin, sharp and 

 unexpanded, columella straight, subvertical, its edge broadly dilated 

 and reflexed above. 



Alt. 24}, diam. 11 ; alt. aperture 10} mill. (Piracicaba). 



Alt. 32, diam. 12} ; alt. aperture 15 mill. (P/r.). 



Alt. 32, diam. 14 mill. (Orb.). 



Near San Roque, prov. Corrientes, Argentina, in a damp forest on 

 the south bank of the river Santa Lucia (Orb.) ; Piracicaba, prov. 

 S. Paulo, Brazil (v. Ihering). 



Helix oreades ORB., Mag. de Zool., 1835, p. 11 ; Voy., pi. 31, f. 11, 

 12. 'Bulimus oreades ORB., t. c. f p. 270. PFR., Monogr., ii, p. 202 ; 

 iii, 422 ; iv, 483; vi, 129. REEVE, Conch. Icon., pi. 48, f. 313. 

 Bulimulus oreades BECK, Index, p. 65. Bulinus sporadicus var. 

 Sow., Conch. 111., f. 78. Thaumastus oreades DOERING, Bol. Acad. 

 Cordoba, iii, p. 73. 



The color pattern is characteristic, soft stripes of a purplish color, 

 occasionally diverging or gable-shaped, upon a fleshy or yellowish 

 ground. 



D. PAZIANUS (Orbigny). PI. 44, figs. 7, 8. 



Shell oblong, pyramidal, a little fusiform, without umbilicus, very 

 thin, diaphanous, fragile, appearing quite smooth to the Baked eye, 

 but wrinkled and irregularly marked with growth lines. White or 

 noticeably roseate, especially on the last whorl and at the apex, 

 ornamented longitudinally with narrow and not well defined brown 

 lines. Spire very conic, quite long, acute at apex, composed of 7 

 closely united whorls, not convex, with inconspicuous suture. 



