DRYM.EUS, SOUTH AMERICAN. 255 



Bidimulus Jtenselii MARTENS, Malak. Bl., xv, 1868, p. 180. 

 Bulimu* henselii PFR., Novit, Conch., p. 464, pi. 101, f. 14, 15; 

 Monogr., viii, p. 44. 



Reminds one somewhat of the' large variety of B. pcpyraceus, but 

 is widely diverse from that in the broad columellar margin. (J/fe.). 



D. ACERVATUS (Pfeiffer). PI. 51, figs. 11, 12, 13. 



Shell acutely oblong ovate, umbilicate, thin. Color either (1) 

 light buff with irregularly spaced brownish oblique streaks and 

 copiously marked with numerous spiral series of dark spots and 

 dots, or (2) dingy reddish-brown with streaks and fewer rows of 

 dots, or (3) buff with bold spiral bands of black or black-brown, 

 subcontinuous below, somewhat interrupted into vertical series of 

 blotches above (var. balteatus). Surface slightly shining, irreg- 

 ularly wrinkle-striate, malleated in places, densely striated spirally, 

 the striae shallow, somewhat effaced in places on some specimens. 

 Spire conic, the apex slightly obtuse, If earlier whorls with typical 

 Drymwus sculpture. Whorls 6 to 61, slightly convex. 



Aperture somewhat exceeding half the total altitude of shell, 

 slightly oblique, irregularly ovate, acute above; outer lip thin, the 

 edge slightly expanded ; columella white, broadly dilated above, 

 vaulted over the rather large and deep umbilicus. 



Alt. 42, diam. 2U, length of aperture 22* mill. 



Alt. 36*, diam. 20, length of aperture 20 mill. 



Southern Brazil : prov. of Sao Paulo at Sorocaba and Botmatu; 

 prov. Parana at Pun.ta Grossa (Dr. v. Ihering). 



Bulimus acermtus PFR., Malak. Bl., iv, 1857, p. 157 ; Monogr., 

 iv, p. 400. 



This fine species has not before been figured. It was described 

 from a unique specimen in the Cuming collection, with the locality 

 " Brazil." The type measures : Alt. 41, diam. 21 mill. ; aperture 

 23 mill, long, 12 wide inside, according to Pfeiffer. 



Somewhat allied to D. poedlus in form, sculpture and in the 

 coloration of the banded form, but the dotted form more closely 

 resembles Bidimulus punctidifer. Besides the typical form (figs. 11, 

 12), and the banded form (v. balteatus, fig. 13), there is a dingy 

 chestnut form with darker streaks, an ill-defined peripheral buff 

 band interrupted by these streaks, a series of long light flammules 

 below the suture, and sparcely. scattered light dots with dark 

 " shadows." This may be called var. paucipunctus (pi. 51, figs. 14, 



