DRYM^EUS, MEXICO AND CENTRAL AMERICA. 85 



D. HETEROGENEUS (Pfeiffer). PL 12, figs. 22, 23. 



Shell subperforate, ovate-turreted, thin, striatulate, decussated with 

 microscopic spiral lines, slightly shining, whitish-corneous. Spire 

 elevated conic, the apex rather acute, suture impressed, simple. 

 Whorls 6^, a little convex, the apical unicolored, following with 

 chestnut lines and dots, last two painted with pale corneous streaks, 

 on the penultimate whorl irregularly spotted ; last whorl about ^ the 

 total length, rounded at base. Columella receding. Aperture ob- 

 lique, angulate lunar ; peristome simple, the right margin a trifle 

 expanded, columellar margin dilated above, overhanging, subap- 

 pressed. 



Alt. 17, diam. 7-|, length of aperture 8 mill. (Pfr.) 



W. Mexico: Tepee, State of Jalisco (Hoge). E. Mexico: Mirador, 

 Pala Gacho, on the road from Vera Cruz to Jalapa, and Rinconada 

 near the same place (Strebel); Vera Cruz (Berendt, type locality). 



Bulimus heterogeneus PFR. in Malak. Blatt. viii, p. 118 (1866); 

 Monogr. Helic. Vivent. vi, p. 118. Bulimulus (Liostracus) hetero- 

 geneus FISCH. & CROSSE, Miss. Scient. Mex., Mollusca i, p. 506. 

 Bulimulus heterogeneus STREBEL, Beitr. Mex. Land- und Siissw.- 

 Conch. iv, pi. 6, fig. 18 a, b; v, p. 92. Otostomus heterogeneus MAR- 

 TENS. Biologia, p. 235. 



" The species approaches 0. livescens, as Strebel has already stated, 

 and 0. discrepans. From 0. livescens it differs in the somewhat 

 more convex whorls, the less tapering spire, the more yellowish hue 

 of the white color, the subangular last whorl, and the very slight 

 turning out of the apertural margin ; the last mentioned character 

 proves it to be adult, although the shell has one whorl less than that 

 of 0. livescens. The stripes are pale brown, disposed at unequal in- 

 tervals, and very variable ; they are seen chiefly on the whorl before 

 the last, sometimes also on the last, while on the other whorls spiral 

 rows of spots, or even bands, also pale, however, predominate. On 

 account of some of the whorls being differently painted to the others, 

 Dr. Pfeiffer seems to have used the name "heterogeneus" which at 

 first leads one to suppose that the species possesses much more pecul- 

 iar and unusual characters " (v. Martens). 



D. TROPICALIS (Morelet). PI. 6, figs. 21, 22, 23. 



Shell sinistral, perforate, long ovate-conic; moderately solid ; white 

 with two or three pink or pinkish-brown spiral bands, the tip of the 



