DRYM^EUS, MEXICO AND CENTRAL AMERICA. 49 



Smith); Mountains near Chilpancingo, Guerrero, in pine and oak 

 forest at 9500 feet elevation (E. W. Nelson). 



Bulimus sulcosus PFR. Symb. Hist. Helic., i. p. 43 (1841) PHIL- 

 IPPI, Abbild. neuer Conch, i, p. 56, pi. 1, fig. 9 PFR. Monogr. 



Helic. Vivent. ii, p. 196 Bulimus (Mesembrinus) sulcosus ALBERS, 



Die Helic. ed. i, p. 157 PFR. in Malak. Blatt. ii, p. 158 (1855). 



Orthalicus (McsemMnui) sulcosus, H. & A. ADAMS, Gen. Rec. Moll, 

 ii, p. 157. Bulimulus (Scutalus) sulcosus MART.,in Albers' Die 

 Helic., ed. 2, p. 217. FISCH. & CROSSE, Miss. Scient. Mex., Mol- 



lusca, i, p. 520, pl*23, fig. 2, 2 a, b Otostomus (Scutalus) sulcosus 



MART. Conch. Mittheil. ii, p. 198; Biol. Centr. Amer., Moll., p. 

 208, pi. 13, f. 3, 3a, 4 Bulimus hyematus REEVE, Conch. Icon, v, 

 Bulimus, pi. 49, fig. 324 (1848). Bulimulus (Scutalus) sulcosus var. 

 a, hiematus MART, in Malak. Blatt. xii, p. 33 (1865). 



Very closely allied to rudis and ghieslreghti, all of them character- 

 ized by the very strong folds of the last whorl. It is likely that the 

 three may prove to be merely varying races of one species. In most 

 specimens the columella and parietal wall are whitish, but in those 

 above recorded from Soledad and Chilpancingo the upper portions of 

 the columella and the parietal wall are deep purplish-rose, the other 

 characters being typical. The interior of the aperture is purplish- 

 rose in all of the specimens before me. Von Martens writes as fol- 

 lows : " All authors describe the aperture of this species as having a 

 simple (not reflected) edge, but I can see in some specimens a very 

 faint, but distinct, expansion of the edge outwards : in one of the ex- 

 amples collected by Mr. H. H. Smith it is quite strong and 2 

 mill, broad. The interior of the aperture is described as chocolate- 

 colored : in the specimens collected by Uhde it is of a greyish 

 rose-color, in those by Mr. H. H. Smith either rose-colored or pure 

 white ; the columella is in all of them white. The largest specimens, 

 long. 44 mill., unicolorous, white, are from the summit of the Sierra 

 de las Aguas Escondidas, 9500 feet, near Omilteme, in the State of 

 Guerrero, collected by Mr. H. H. Smith." 



D. RUDIS (Anton). PL 15, figs. 43-46 ; pi. 10, figs. 65, 66, 67. 



Shell openly perforate, ovate-conic, sculptured with coarse, irreg- 

 ular growth strias ; a little shining ;. white, flamed and banded with 

 brown and livid. Spire rather lengthened, the apex acute. Whorls 

 5^, a little convex, the last inflated, as long as the spire. Aperture 



