46 DRYM^EUS, MEXICO AND CENTRAL AMERICA. 



square and arranged in spiral rows (Philippi, and specimens from 

 Chihuahua), or more irregular and combined, sometimes at acute 

 angles (specimen from Ventanas). In a specimen from Chihuahua 

 the pale spots of the type are seen within some of the larger brown 

 patches. The sculpture of this species is somewhat coarsely rugoso- 

 striate, but it cannot be termed undulated, as in 0. fenestratus Pfr. 

 Most of the -specimens I have seen show remarkable irregularities 

 and scars, some even at the apex, caused by previous fractures dur- 

 ing life. Probably they live on conspicuous objects during the wet 

 season, and often fall to the ground. (Martens.) 



V'dr.forreri (Mousson). PL 10, figs. 56, 57, 58. 



Shell oblong-ovate, rimate-perforate, rather thin, irregularly sub- 

 plicose-striate ; dull whitish, painted with grayish spots in series or 

 obscure zigzag streaks and clouds. Spire conic, the outlines a trifle 

 convex, apex white, polished ; suture a little impressed, rather ir- 

 regular. Whorls 6, a little convex, regular, the last not descending, 

 ovate, sub vertical, longer than the spire. Aperture broadly oval, 

 whitish inside, weakly showing the markings through ; peristome 

 well expanded, acute, the margins converging, joined by a very 

 thin lamina ; columellar margin broadly reflexed. Alt. 37, diam. 

 21 mill. (Mouss.) 



N. Mexico : Chihuahua (Hoge) N. W. Mexico : Ventanas, State of 

 Durango (Forrer), and near Mazatlan (Gabb). 



Bulimus fenestratus (Pfr.), PHILLIPI, Abbild. neuer Conch, iii, p. 

 96, pi. 9, fig. 1, 5. Bulimulus fenestratus STREBEL, Beitr. Mex. 

 Land- und Siissw.-Conch., v. p. 75, pi. 6, fig. 19 Bulimus (Mesem- 

 brinus) fenestralis ALBERS, Die Helic. ed. 1, p. 157 (misprint). 

 Bulimulus forreri, MOUSSON, Journ. de Conch., xxi, p. 217, pi. 9, 

 2 (1883). Otostomus dunkeri var. forreri MARTENS, Biol. Centr. 

 Amer.,MolL, p. 207, pi. 13, f. 2, 2 a. 



D. CHAPERI (Crosse & Fischer). PI. 15, figs. 29, 30. 



Shell nearly covered perforate, long-ovate; dull whitish, with, 

 rather widely-spaced pale-brown streaks and longitudinal, close, 

 somewhat oblique impressed wrinkles. Spire rather long, the apex 

 rounded, suture simple. Whorls 6-J, a little convex, the first two 

 smooth, the following strongly wrinkle-striate, last longer than the 

 spire, ventricose, inflated, tapering at base. 



Aperture oblong-ovate, whitish inside ; peristome simple, whitish, 



