BULIMULUS-CENTRAL AMERICAN. 53 



" Transparent white streaked with pale brown near the apex. It 

 is possible that this may be a light variety of a species of more color, 

 from the indications of marking near the apex " (RveJ). 



B. UNICOLOR (Sowerby). PI. 10, fig. 73. 



Shell perforate, ovate-conic, more or less elongated, thin, corneous- 

 brown. Su rface slightly shining, with slight growth-wrinkles. Spire 

 of a little over 5* whorls, the apex obtuse; nepionic whorls 

 minutely, shallowly wrinkle-granose and spirally striated. Whorls 

 convex, the last well rounded ; sutures impressed. Aperture ovate, 

 brownish inside ; outer lip unexpanded, acute ; columellar lip di- 

 lated and reflexed above. 



Alt. 15*, diam. 8 mill. ; alt. of aperture 7 mill. (Panama). 



Alt. 15, diam. 7 mill. ; alt. of aperture 6i mill. (Labna). 



Alt. 14, diam. 1\ mill. ; alt. of aperture 6f mill. (Labna). 



Perico Island, Bay of Panama, on dead leaves (Cuming) ; Grey- 

 town, Nicaragua (R. Tate) ; Istapa, Pacific coast region of S. Guate- 

 mala, in forest (Morelet, for var. istapensis) ; Northern Yucatan, at 

 Progreso, Tekanto, Sitilpech, Tunkas, Calcehtok, Ticul, Tabi, Uxmal 

 and Labna (Heilprin, Baker, Stone, Ives, see Proc. A. N.S., Phila., 

 1891, p. 310). 



Bulinus unicolor Sows., P. Z. S., 1833, p. 73 ; Conchol. Illustr., f. 

 43. Bulimus unicolor DH. in Lam., An. s. Vert., viii, p. 280. PFR., 

 Monogr., ii, p. 219 ; Couchyl. Cab., p. 234, pi. 62, f. 41, 42. REEVE, 

 Conch. Icon., v, pi. 21, f. 133. Bulimulus (Leptomerus) unicolor 

 v. MART, in Alb., Die Hel., p. 222 ; Biol. Centr. Amer., Moll., p. 247 

 (including petenensis and istapensis as varr.). Not Bulimus cor- 

 neus Lea. ? B. berendtii CROSSE & FISCHER, Moll. Mex., p. 554, 

 pi. 21, f. 8, 8a. 



This species varies much in degree of elongation and in size, and 

 has no prominent specific characters. It is more slender than B. 

 coriaceuv, and lacks chestnut color on the spire. 



Sowerby's original description is as follows : Shell oblong, corne- 

 ous, thin, the apex obtuse ; whorls 6, ventricose, striated, with dis- 

 tinct sutures; aperture ovate, the margin thin, acute; umbilicus 

 small. Length 0'8, diam. 0'3 inch ( 20, 7* mill.). 



This indicates a somewhat larger shell than the specimens I have 

 seen. 



Var. ISTAPENSIS Cr. & Fisch. PL 10, fig. 81. 



Shell nearly covered umbilicate, ovate-elongate, thin, minutely 

 and subobliquely striated, shining, dull whitish-hyaline ; spire sub- 



