DRYM^EUS, MEXICO AND CENTRAL AMERICA. 69 



" The varieties a and b have been procured in company, together 

 with specimens approaching to c (see fig. 16), both by Boucard 

 and Biolley, on the slopes of the Volcan de Irazu. Of var. c, 1 know 

 of only one specimen, here figured, found among those collected by 

 Van Patten : in one of his examples the peristome is slightly ex- 

 panded. 



" This species agrees with 0. tripictus in having a rose-colored, 

 simple peristome, but differs from it in the more elongate form and 

 the rougher sculpture of the shell, also in the style of painting." 

 (Martens.') 



D. TRIPICTUS (Albers). PI. 6, figs. 12, 13, 14, 15. 



Shell very narrowly perforate, ovate, ventricose, thin ; white or 

 yellowish-white, with three to five brown girdles elaborately figured 

 with white, or reduced to bands of arrow-shaped spots ; sometimes 

 bandless, longitudinally streaked and more or less variegated with ob- 

 lique, zigzag whitish lines. Surface glossy, striatulate, without spiral 

 striae. Spire short, conic, the apex obtuse, with typical Drymaus 

 sculpture. Whorls 4|, rather convex, the last ventricose. 



Aperture large, oblique ; peristome thin, not expanded, bordered 

 inside and out with pink ; columella pink, slender, subvertical, more or 

 less concave, the edge shortly reflexed above. 



Alt. 20, diam. 13, length of aperture 12^ mill. 



Alt. 17, diam. 11, length of aperture 10J mill. 



Costa Rica (Coll. Mousson, Carmiol, Gabb). 



JBulimus tripictus ALBERS, in Malak. Blatt. iii, p. 97 (1857) 

 PFR., Monogr. Helic. Vivent. iv, p. 468. VON MARTENS, in Jahr- 



biicher d. deutschen Malak. Ges., iii, p. 256 ANGAS, P. Z. S., 1879, 



p. 478. Otostomus tripictus MARTENS, Biol. Centr. Amer., p. 225, 

 pi. 14, f. 11, lla (var. hojfmanni). Bulimulus rhodotrema, VON 

 MART., in Malak. Blatt. xv, p. 156 (1868); see also Jahrb. d. M. 

 Gesell. iii, p. 256 (1876). Bulimus rhodotrema PFR., Novit. Conch, 

 iii, p. 463, pi. 101, fig. 10, 11; Monogr. Helic. Vivent. viii, p. 146. 



Easily recognized by its globose form, roseate peristome and the 

 complicated pattern of the bands, which are cut into spots or figures 

 of very irregular and various shapes by oblique or zigzag lines or dots, 

 in endless variety of design. Often the bands, typically five in num- 

 ber, are reduced to three by loss of the upper and lower ones, or their 

 coalescence with the adjacent bands ; and sometimes they are re- 



