68 BULIMULUS-SOUTH AMERICAN. 



33; Monogr., ii, p. 202. REEVE, C. Icon., f. 114. See also, HID- 

 ALGO, Journ. de Conch., 1875, p. 128 : 1870, p. 60. 



Typical SPORADICUS Orb., as restricted by Pfeiffer, is brownish or 

 whitish, with brown longitudinal streaks (figs. 12-14). The var. sub- 

 tropicalis of Doering is a synonym. 



Chiquitos region, Bolivia. 



Var. BONARIENSIS Strobel. 



Shell more ventricose, thinner, paler, of a unicolored ashy-yellow. 

 Alt. 25, diam. 14 mill. 



Buenos Ayres, Argentina. 



Var. MONTEVIDENSIS Pfeiflfer (pi. 11, fig. 19), is opaque white 

 with close, narrow longitudinal corneous streaks ; often showing an 

 indication of peripheral angulation, produced by color rather than 

 by form. 



Alt. 31, diam. 15 ; alt. of aperture 15 mill. 



Alt. 33, diam. 14J ; alt. of aperture 14? mill. 



Montevideo, Uruguay* 



PfeifFer was the first to restrict Orbigny's species, so that the above 

 arrangement of the varieties should replace that proposed by Doer- 

 ing, as well as the transposition advocated by Hidalgo. The apex 

 in this species is not smooth, as in Lissoacme, but minutely pitted, 

 pits closely arranged in oblique series, the sculpture scarcely visible 

 on many adult shells from the effects of wear, but constantly pres- 

 ent on young and unworn adult specimens. The jaw has about 12 

 vertical riblets ; teeth in nearly straight transverse rows. 



B. CORUMBAENSIS Pilsbry. PI. 14, figs. 3, 4, 5, 6, 7, 8. 



Shell umbilicate, ovate, with rather lengthened spire; rather thin 

 but solid and strong when adult ; opaque-white, with numerous dark 

 brown or corneous longitudinal streaks, the last whorl often becom- 

 ing abruptly darker below the periphery ; surface shining, with 

 irregular growth-wrinkles, no spiral strise or with only the faintest 

 traces of them. Spire conic, the lateral outlines nearly straight; 

 apex small, obtuse, H earlier whorls reddish-corneous, densely and 

 distinctly wrinkled in finely zig-zag pattern, sharply defined from 

 the after-growth. Whorls fully 7, but slightly convex, slowly 

 widening, separated by impressed sutures. 



Aperture ovate, slightly oblique, white or slightly streaked within, 

 somewhat less than half the length of the shell ; edge of outer lip 



