BULIMULUS-PLECTOSTYLUS. 11 



C. Icon., pi. 16, f. 95. GAY, Hist, de Chile, viii, p. 103, pi. 2, f. 3. 

 HIDALGO, Journ. de Conch., 1870, p. 59 ; Viaje al Pacifico, p. 

 116. Succinea coquimbensis PFR., Symbolse,ii, p. 131. 



While some forms of this species resemble B. perelegans in color- 

 ing, still coquimbensis is a species of coarser texture, and in the aver- 

 age, more speckled coloration ; moreover, it is more granulated 

 below the sutures, or shows spiral girdles of longitudinal puckers 

 there, while the other species is smooth. The contour varies in wide 

 limits, as may be seen by the measurements given above; so that 

 while typical examples of coquimbensis and perelegans are readily 

 distinguished, there are other specimens hardly separable except by 

 attention to the slight sculptural features above noted. 



Var. PERELEGAXS Pilsbry, n. n. PL 8, figs. 18, 19, 20, 21, 22. 



Shell im perforate, oblong-ovate, thin. Corneous, closely striped 

 longitudinally with opaque white, and having narrow interrupted 

 streaks or longitudinal lines of brown ; showing more or less tendency 

 to form narrow interrupted spiral girdles, at least toward the base. 

 Surface glossy, with low, irregular and inconspicuous growth- 

 wrinkles ; lacking spiral striation and not granulated. Whorls 5, 

 but feebly convex, the last somewhat obliquely descending. Apical 

 sculpture an excessively faint and superficial minute net-work on a 

 glossy surface. 



Aperture decidedly over half the alt. of shell, long-ovate, sub- 

 vertical, inside colored like the exterior except that buff replaces 

 the white ; outer lip thin and simple ; columella very thin, concave 

 below, with a slight fold above, its edge reversed and appressed. 



Alt. 34, diam. 17 mill. 



Alt. 29, diam. 16 mill. 



Near Huasco, Chili (Bridges, Gay). 



Succinea elegans PFR., P. Z. S., 1842, p. 187; Syrnb., ii, p. 56. 

 Not Succinea elegans Risso, 1826. Bulimus elegans PFR., Sym- 

 bolse, iii, p. 54; Monographia, ii, p. 148; vi, 89; Conchyl. Cab., 

 p. 214, pi. 60, f. 7, 8. GAY, Hist, de Chile, viii, p. 104, pi. 3, f. 2. 

 REEVE, Conch. Icon., pi. 19, f. 112. 



Not granulated below the sutures as B. coquimbensis is, and 

 smaller, more fragile, with less oblique aperture and livelier, less 

 dotted coloration ; but still an almost complete series of intermediate 

 forms exists among the numerous examples of the two before me, so 

 that I hesitate to give this form specific rank. Reeve's figure repre- 



