8 DRYM^EUS, MEXICO AND CENTRAL AMERICA. 



cimens are comparatively rare. An unusually large specimen long. 

 28, diam. 14, apert. 11 mill. found at Panzos (Conradt), has been 

 sent to me by Prof. Hausknect of Weimar ; its bands are very dark, 

 nearly black, the shell thus approaching 0. nigro-fasciatus Pfr., from 

 Colombia [vol. xi, p. 307, pi. 50, figs. 98, 99], but differs from it in 

 the distinct spiral striation and the comparatively narrower bands." 



Var. JUQUILENSIS Martens (fig. 40). Bands narrower. Length 19^, 



diam. 9-10 mill. 



S. Mexico: Juguifa, in the State of Oaxaca (Boucard) ; Oaxaca 

 (Uhde). N.Guatemala: Vera Paz (Salvin). 



Bulimus virgulatus TRISTRAM, P. Z. S., 1863, p. 412 Bulimus 

 alternans var. #, PFR., Monogr. Helic. Vivent. vi, p. 131. Bulimu- 

 lus (Liostracus) alternans, var. /3, FISCH. & CROSSE, Miss. Scient. 

 Mex., Mollusca i, p. 501, pi. 23, fig. 5a. Otostomus (Liostracus) 

 alternans VON MART. Conch. Mittheil. ii, p. 192. Bulimulus (Lios- 

 tracus} mexicanus, var., VON MART., in Malak. Blatt. xii, p. 24 

 (1865) (ex parte). 



D. TRICINGULATUS (Anton). 



Shell oval-conic, spire nearly steeple-shaped, acute ; 7 rather flat 

 whorls with deep suture, the last whorl two-fifths the whole length ; 

 translucent, shining, smooth ; light yellow with three dark-brown 

 bands on the last whorl, and two light brown ones on the others ; 

 perforate ; aperture oval-oblong. Alt. 1 inch 1 line, diam. 6 lines. 

 (Anton.) Saboja Ins. (Anton). 



Bulimus tricingulatus ANT., Verzeich. der Conch. Sammlung 

 H. E. Anton, p. 43, no. 1566 (1839) PFR., Monogr. ii, p. 212. 



More lengthened than vexillum (Brod.), the last whorl more obese, 

 somewhat shorter, and, therefore, more conic-oblong. Besides the 

 ground-color, the slim form and delicate peristome also distinguish it 

 from trifasciatus Brug. (Anton.) 



Has not been recognized by later authors. The locality is evi- 

 dently Taboga island, in the Bay of Panama. 



D. HONDURASANUS (PfeifFer). PI. 15, fig. 41. 



Shell openly perforate, ovate-conic, smooth, shining ; yellowish- 

 white, ornamented with three bands and an umbilical area of rose- 

 brown. Spire conic, acute, whorls 6, a trifle convex, the last a little 

 shorter than the spire ; columella straightened, vertical, the aperture 



