DRYM^EUS, MEXICO AND CENTRAL AMERICA. 31 



c. More or less wrinkled or plicatulate. 



Group of D. sitlcosus, p. 



c' . Smoother. Group of D. attenuatus, p. 



I". Elongated, thin, often translucent, unicolored or with 

 bands or rows of spots ; spirally striated, nearly smooth, 

 glossy. Group of D. totanacus, p. 



Group of D. sulphureus, p. 

 Group of D. allernans, p. 

 b" f . Elongated, rather opaque, streaked or banded. 



Group of D. multilineatus, p. 27. 



GROUP OF D. JOSEPHUS. 

 D. ZHORQUINENSIS (Angas). PL 26, figs. 14, 15. 



Shell perforate and openly rimate, ovate-conic, rather solid ; whit- 

 ish, with oblique, spaced brown streaks, narrower than their inter- 

 vals. Surface smooth, marked with slight growth lines. Spire conic, 

 the apex rather obtuse ; whorls nearly seven, convex, the first with 

 typical Drymaus sculpture, the last full, very convex below, ascend- 

 ing toward the lip. 



Aperture vertical, ovate, the peristome very broadly expanded, 

 white ; columellar margin broadly dilated, channelled at its junction 

 with the whorl; columella with a deep spiral fold. Alt. 44, diameter 

 23^, length of aperture 23J mill. 



S.-J3. Costa Rica: middle Zhorquin to Cuabre, on low hills and flat 

 ground (Gabb). 



Bulimus zhorquinensis ANGAS, P. Z. S. 1879, p. 478, pi. 40, f. 4. 

 Otostomus zhorquinensis MARTENS, Biol. Centr. Amer., p. 202. Bull- 

 mulus (Scutalus) pallidior, " specimens from Costa Rica," DALL, 

 Proc. U. S. Nat.JVIus., xvi, 1893, p. 640. 



Allied to D.josephus only, among known Mexican shells, though 

 as Angas remarks, the great expansion of the peristome gives it a 

 resemblance to D. expansus, Pfr., which also has a widely-open 

 rimation. Angas' figures (which are copied on my plate) do not 

 show the broad flare of the columellar lip very well. The brown 

 streaks are also closer than in the specimen in the Academy collec- 

 tion. Somewhat worn and decolored specimens collected by Senor 

 Zeledon in Costa Rica were referred by Dall to B. pallidior y which 

 they much resemble. 



