DRYM^US, SOUTH AMERICAN. 297 



Bulimus bolivianos REEVE, Conch. Icon., pi. 44, f. 281 (not of 

 Pfr.). B. annulatus EYE., t. c. under sp. 599 (Dec., 1849). PFR., 

 Monogr., iii, p. 346. 



First described by Reeve as Pfeiffer's bolivianus. Pfeiffer consid- 

 ers B. cerussatu* Reeve a variety of annulatus, but, if so, it will take 

 priority over the latter. 



Group of D. depictus. 



Rather a heterogeneous assemblage of Colombian and Venezuelan 

 species having the lip thin, unexpanded or but slightly so, and usu- 

 ally maculated or streaked. 



D. SEMIMAOULATUS Pilsbry, n. n. Vol. XII, PI. 5, figs. 8, 9. 



Shell narrowly umbilicate, ovate-pyramidal, slender, thin ; white, 

 slightly translucent, above the periphery having three faint or 

 hardly visible brownish spiral bands marked at irregular intervals 

 with squarish brown spots, which are arranged in vertical rows, and 

 below the periphery with a subcontinuous brown band on the base, 

 and another, often obsolete, around the umbilicus. Shining, smooth 

 to the eye, but under a lens slight growth-wrinkles are seen, and a 

 fine sculpture of clear-cut, incised spirals, rather close but irregu- 

 larly spaced. Whorls 6i, nepiouic If minutely grated, the rest but 

 slightly convex. 



Aperture ovate, somewhat oblique, less than half the shell's length ; 

 peristome thin, with almost imperceptibly everted edge in completely 

 adult examples ; columellar margin broadly and flatly dilated and 

 reflexed above ; columella nearly straight. 



Alt. 22'2, diam. 10'5 ; alt. of aperture 9'6 mill. (type). 



Alt. 19'5, diam. 9*8 ; alt. of aperture 8*3 mill. 



Carthagena, Colombia (Gibbon) ; Tributaries of the upper Ama- 

 zons (Bartlett) ; Ghiriqui, southern Panama ; Costa Rica (Gabb) ; 

 San Nicolas, central Nicaragua (Tate) ; coast near Champerico, 

 western Guatemala (Stoll) ; Dolores and San Luis, district of Peten, 

 northern Guatemala (Morelet). 



Bulimus maculatus LEA, Trans. Amer. Philos. Soc., vi, 1839, 

 p. 86, pi. 23, f. 112; Obs. Genus Unio, etc., ii, p. 86, pi. 23, f. 

 112. PFR., Monogr. Helic. Vivent, ii, p. 205. REEVE, Conch. 

 Icon., v, Bulimus, pi. 48, fig. 309. TATE, Am. Journ. Conch., 1870, 

 p. 156. ANGAS, P. Z. S., 1879, p. 479 [not B. maculatus, Bruguiere 

 (1792), which =Glandina dominicensis Gmel.]. Bulimus (Lepto- 



