DRYM^EUS, MEXICO AND CENTRAL AMERICA. 47 



the margins distant, columellar margin expanded, nearly closing the 

 perforation, basal and outer margins thin, subexpanded, a little re- 

 flexed. 



Alt, 43, diam. 25, length of aperture 2G mill. (C. $ F.) 



Island of Mescala, in lake Chapala, State of Jalisco, Mexico. 

 (Chaper). 



BuKmulus chaperi C. & F., Jour, de Conch., 1892, p. 296 (1893); 

 1893, p. 31, pi. 1, f. 1, 2 FISCHER, t. c., p. 32, pi. 1, f. 2 (animal 

 living). 



This species, of which I have not seen specimens, should probably 

 stand as a race or variety of D. dunkeri. It is near var. forreri 

 Mousson. 



D. COLIMENSIS (Rolle). 



Shell conic-elliptical, perforate, rugose-striate, whitish, ornamented 

 with three series of violaceous-brown spots on the whorls of the spire, 

 five on the last whorl. Whorls 6^, rather flattened, separated by a 

 slightly impressed suture, the upper 3 whorls unicolored, apex rather 

 obtuse, last whorl more convex, perceptibly tapering at base, brown 

 tinted in the umbilical region. 



Aperture elliptical, very slightly oblique; peristome narrowly ex- 

 panded, thin, white, the basal margin narrowly rounded, columellar 

 margin rather widely reflexed, triangularly dilated above, violaceous 

 tinted in well-preserved specimens; parietal callus thin but distinct. 



Alt. 31, diam. 15, length of aperture 15 mill. (Rolle). 



Colim a, Mexico. 



Otostomus colimensis ROLLE, Nachrichtsbl. d. d. Malak. Ges., 

 xxvii, p. 130 (August, 1895). 



According to Rolle this is nearest to D. fenestrellus and D. dunkeri 

 var. forreri, distinguished from the former by the reflexed peristome, 

 from the latter by the more lengthened contour and less obese whorls. 



GROUP OF D. SULCOSUS. 



D. BOTTERII (Crosse and Fischer). PL 15, figs. 34, 35. 



Shell perforate, oblong-conic, rather thin, but somewhat solid, a 

 little shining, impressed with rather strong, somewhat distant longi- 

 tudinal wrinkle-stria, decussated by numerous very delicate transverse 

 lira, visible only under a lens ; pale fleshy reddish, transversely 



