DUYMJEUS, MEXICO AND CENTRAL AMERICA. 81 



Beitr. Mex. Land- und Siissw. -Conch, v, p. 91, pi. 6, fig. 4. Otos- 

 tomus livescens VON MARTENS, Biol. Centr. Amer., p. 228, pi. 15, f. 

 7, 8 (van). 



The original diagnosis describes the shell as streaked, no bands 

 being mentioned ; and the locality was merely " Mexico." It seems 

 allied to moritinctus and especially to discrepans. Von Martens 

 enumerates the following color-forms : 



a. Brown bands and streaks distinct. 



b. Bands and interstitial streaks paler. 



c. Three bands, no streaks (fig. 79). 



d. Upper band narrow, lower a little wider, a series of spots be- 

 tween (fig. 78). 



e. T\vo basal bands (figs. 80, 81). 



/. Subunicolored whitish, with a few streaks (typical form). 



D. DISCREPANS (Sowerby). PI. 12, figs. 18, 19. 



Shell subperforate, oblong-ovate, thin ; whitish, with few or num- 

 erous narrow, brown, obliqtiely-longitudinal streaks, interrupted at the 

 periphery by a narroic white spiral band, below which there is a faint 

 or distinct, wide corneous band upon which the streaks reappear, suc- 

 ceeded by a wide tvhitish band ; a very narrow umbilical area being 

 defined by a narrow brown band. Surface shining, smooth, under a 

 strong lens showing slight growth-stria? and faint, fine, dense spiral 

 lines. Spire conic, the apex obtuse, with typical Drynuzus sculpture. 

 Whorls nearly G, moderately convex. 



Aperture less than half the shell's length, ovate, striped inside, 

 oblicpje ; peristome thin and not expanded ; columellar margin nar- 

 rowly reflexed at the perforation, which it nearly closes. 



All. 18, diam. 9, length of aperture 8 mill. 



Alt. 17, diam. 8, length of aperture 7| mill. 



Central Guatemala: Salama (Morelet); San Geronimo near Salama 

 (Champion). E. Guatemala: Zacapa, on Cereus sp. (Stoll). Sal- 

 vador: Conchagua, under the bark of trees (Cuming; type locality). 

 Central Nicaragua: Granada, Masapa, San Nicolas, in the Savana 

 region (Tate). ^V. W. Costa Rica: Guanacasta, in the Bay of Sali- 

 nas, in the woods (Pittier). 



Bulinus discrepans SOAVERBY, P. Z. S., 1833, p. 72; Conch. II- 

 lustr., Bulinus, fig. 52. Bidimus (Bulimulus) discrepans BECK, 

 Index Moll., p. 65. Bidimus discrepans DES.HAYES, in Lamarck's 

 6 



