DRYM^EUS, MEXICO AND CENTRAL AMERICA. 45 



but there are transitions between them in size, form, and color. For 

 example, one of Dr. S toll's -specimens from Vera Paz (fig. 48) is 

 only 27 millim. long, but it exhibits the slender figure and more solid 

 shell of Var. C. Fischer and Crosse do not give separately the 

 localities for the different varieties which they have described and 

 figured. Tate doubtfully records the occurrence of the species in 

 Nicaragua * in the mountain-forests of Javali and Pena Blanca, 

 at an elevation of about 2500 feet above the sea,' and at ' Chontales;' 

 he does not mention either the size or the coloration of his specimens, 

 so that we cannot refer them even by conjecture to any of the three 

 forms which are indicated above." (Mtirtens.) 



D. DUNKERI (Pfeiffer). PI. 10, figs. 54, 55 j pi. 15, fig. 31. 



Shell perforate, ovate-conic, rather thin, longitudinally roughly 

 striate and obsoletely reticulated by impressed spiral lines; whitish- 

 buff, streaked and maculated with reddish-brown, and with smaller 

 scattered white spots. Whorls 6, rather fiat, the last as long as the 

 spire. Columella vertical, inflated : aperture oblong-oval ; peristome 

 simple, the margins distant, outer lip somewhat expanded, columellar 

 lip broadly reflexed; Alt. 37, diam. 16, length of aperture 19 mill. 



Central Mexico : State of Michoacan (Hegewisch, Uhde); Lake 

 Patzcuaro, in the same state (Baker, Heilprin). W. Mexico : Tepic 

 (Richardson); inland from Guaymas (Gabb, pi. 15, fig. 31). 



Bulimus dunkeri PFR. in Philippi's Abbild. neuer Conch, ii, p. 112, 

 pi. 4. fig. 10 (1846); Monogr. Helic. Vivent. ii, p. 101 REEVE, 

 Conch. Icon, v, Bulimus, pi. 74, fig. 533 Bulimus (Mesembrinus) 

 dunkeri ALBERS, Die. Helic, ed. i, p. 157. Bulimus (Drymceus) 

 dunkeri PFR. in Malak. Bliitt., ii, p. 151 (1855). Orthalicus 

 (Mesembrinus) dunkeri, H. & A. ADAMS, Gen. Rec. Moll, ii, p. 157. 

 Bulimus (Scutalus") dunkeri v. MART, in Malak. Blatt., xii, p. 36 

 (1865) FISCH. & CROSSE, Miss. Scient. Mex., Mollusca, i, p. 511. 

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

 Conch. v, p. 76. Otostomus dunkeri v. MART., Biol. Centr. Amer., 

 Moll., p. 207, pi. 13, f. 1. 



The typical form (pi. 10, figs. 54, 55 ; pi. 15, fig. 31, specimen 

 from inland from Guaymas) is easily recognizable by the pale round 

 spots on a brownish ground. In the variety the brown color is 

 limited to more or less numerous patches, which are either somewhat 



