50 DRYM^EUS, MEXICO AND CENTRAL AMERICA. 



oblong-oval, brownish [or white] inside, black-striated, shining ; 

 peristome acute, the columellar margin vaulted, dilated (Pfr.). 



Alt. 23, diam. 13, length of aperture 12 mill. 



Alt. 24J, diam. 13, length of aperture 12^ mill. 



Central Mexico : environs of the city of Mexico (Halm); Chapulte- 

 pec (Hegewisch, Heilprin); Anganyues, State of Michoacan (Deppe). 



Bulimus rudis ANTON, Verz. d. Conch. Samml. p. 43 (1839) 



PFR. Symb. Hist. Helic. ii, p. 50 ; Monogr. Helic. Vivent. ii, p. 197. 

 REEVE, Conch. Icon, v, Bulimus, pi. 44, fig. 286. Bulimus 

 (Mesembrinus) rudis ALBERS Die Helic. ed. i, p. 157. PFR. in 

 Malak. Blatt. ii, p. 158 (1855) Orthalicus (Mesembrinus) rudis, 

 H. & A. ADAMS, Gen. Rec. Moll, ii, p. 157. Bulimulus (Scutalus) 

 rudis, FISCH. & CROSSE, Miss. Scient. Mex., Mollusca, i, p. 523, pi. 

 23, figs. 6, 6a ; pi. 22, figs. 7-11 (jaw, radula, anatomy) Bulimu- 

 lus rudis STREBEL, Beitr. Mex. Land- und Siissw.-Conch. v, p. 63, 

 pi. 5, fig. 3; pi. 6, fig. 9. Otostomus (Scutalus) rudis, MART., 

 Conch. Mittheil. ii, p. 193. Bulimulus sulcosus, form A, STREBEL, 

 Beitr. Mex. Land- und Siissw.-Conch. v, p. 61, pi. 5, figs. 1,2; pi. 



11, flgs. 12 a, b, 13, 14, 15; pi. 13, fig. 8 (radula) ^Bulimulus 



(Scutalus) sulcosus, var P- fenestratus, MART, in Malak. Blatt. xii, 

 p. 34 (1865) Otostomus rudis MART., Biologia p. 209. 



The thinner, more ventricose shell, usually much le&s strong sculp- 

 ture, and bold striping, distinguish this species from D. sulcosus. Of 

 twelve specimens before me, two show three somewhat interrupted 

 spiral bands in connection with the usual streaks ; the others have 

 longitudinal stripes or ragged streaks only. Figs. 43, 44 of pi. 15 

 are drawn from specimens from the gardens of Chapultepec, near the 

 City of Mexico, collected by Heilprin's Mexican Expedition. They 

 are very smooth for the species, being merely wrinkle-striate, and 

 thin, almost fragile. Figs. 45, 46 are from specimens more like that 

 illustrated by Fischer & Crosse. The blackish streaks vary from a 

 dozen on the last whorl, to two or three, and may be either continuous 

 or ragged and blotched. 



D. GHIESBREGHTI (Pfeiffer). PI. 15, figs. 32, 33 ; pi. 1, figs. 72-80. 

 Shell perforate, ovate-conic, solid, somewhat rugulose-striate, 

 scarcely shining ; white, ornamented with sparse brown streaks. 

 Spire rather regularly conic, the apex somewhat acute, suture mi- 

 nutely serrulate. Whorls 6, the upper ones hardly convex, the last 



