84 DRYM^US, MEXICO AND CENTRAL AMERICA. 



sis, and the majority of the other species of this genus, we shall, per- 

 haps, prefer to regard the coloration as white with fawn bands, but 

 then we must admit that the uppermost band reaches the suture and 

 the lowest one the umbilicus, and that the unicolorous subvariety c 

 is produced by all the bands uniting together. The variation in the 

 number of bands is caused by the uppermost disappearing, and by the 

 fourth and fifth uniting into one. 



k ' This species, as regards the shell, bears some resemblance to 

 Bulimulus exilis Gmel. (guadelupensis Brug.), the type of the genus 

 Bulimulus ; but having examined the radula of 0. uhdeanus, I have 

 found that it agrees better with that of Otostomus, the median tooth 

 being also remarkably smaller than the neighboring ones" (v. Mar- 

 tens). 



The following varieties are distinguished by von Martens : 



A. Typical. Length 22, diam. and aperture 10 mill. 



a. Whitish, with 3-5 pale fulvous equal bands (figs. 49, 50). 



b. Whitish, with 5 pale fulvous bands spotted with brown 



(fig. 48.) 



c. Unicolored pale fulvous (fig. 47). 



B. Var. cuernavacensis C. & F. (pi. 15, figs. 42, 51). Larger, the 

 bands more distinct, rather broad ; length 29, diam. 15, aperture 13 

 mill. 



Central Mexico : Cuernavaca (Boucard). E. Mexico, Orizaba and 

 Maltrata, a little west of Orizaba (Hoge). 



Bulimulus (Scutalus) cuernavacensis CROSSE & FISCH., in Journ. 

 de Conch, xxii, p. 283 (1874); FISCH. & CROSSE, Miss. Scient. 

 Mex., Mollusca i, p. 532, pi. 23, fig. 11, lla (young?) Bulimus 

 cuernavacensis PFR., Monogr. Helic. Vivent. viii, p. 152. Bulimulus 

 cuernavacensis STREBEL, Beitr. Mex. Land- und Siissw.-Conch. v, p. 

 65, pi. 12, fig. 17. 



0. Var. tepecensis Martens (pi. 15, fig. 52). Smaller, upper whorls 

 banded, median ones maculated, the last pale, with one wide weak 

 band on the base. Alt. 18, diam. 9, aperture 8-| mill. 



West Mexico: Tepee, State of Jalisco (Hoge). 



D. Var. borealis Martens (pi. 15, fig. 53). Smallest, grayish-white, 

 above with 1-3 series of spots, beneath with one wide pale band. 

 Alt. 15, diam. 8, aperture 7 mill. 



N.- W. Mexico : Ventanas, State of Durango, at 2000 ft. elevation. 

 (Forrer.) 



