SIMPULOPSIS. 221 



J 



a 1 . Diameter of shell slightly under its length ; ovate ; whorls 5. 



Umpida, p. 223. 



a 2 . Diameter of shell to J its length ; ovate-conic ; whorls 5 ; 

 periphery rounded. citrinovitrea, p. 221. 



a 3 . Diam. of shell over J its length ; globose conic ; whorls 4. 



b. Brownish-yellow; periphery faintly angular; alt. 11-13 



mill. loissieri, p. 222. 



b l . Alt. 7 mill. progastor, p. 223. 



S. PSEUDOSUCCINEA (Moricand). PL 64, figs. 4, 5. 



Shell im perforate, oblong-ovate, /SWcmm-shaped, very thin and 

 fragile. Decidedly translucent, the columella visible through the 

 shell; whitish corneous or faintly yellowish. Surface glossy, with 

 slight growth-wrinkles, nepionic lj whorls with excessively fine, 

 close, spiral striation. Spire conic, the apex rather obtuse. Whorls 

 about 5J, moderately convex, with well impressed sutures, the last 

 whorl oblong, tapering above and below, a faintly sketched, hardly 

 noticeable angle traced around the periphery. 



Aperture oblique, ovate-pointed, broadly rounded below; lip sim- 

 ple, unexpanded ; columella concave below, thread-like, with a faintly 

 convex spiral trend above ; basal view showing a narrow " false um- 

 bilicus" extending to apex. 



Alt. 23^, diam. 11 ; length of aperture 12^ mill., or smaller. 



Environs of Bahia, Brazil (Blanchet, v. Ihering). 



Helix pseudosuccinea MORICAND, Mem. Soc. Phys. et d' Hist. Nat. 

 de Geneve, vii, p. 435, pi. 2, f. 18 (1835-6). Bulimus pseudosuc- 

 cinea DESH. in Lam., Anim. s. Vert, viii, p. 248. POT. & MICH., 



Galerie, i, p. 140, pi. 13, f. 5, 6 PFR., Monogr. ii, p. 148; iii, 302; 



iv, 450; vi, 89; viii, 125 ; Conchyl. Cab. p. 216, pi. 60, f. 5, 6 



REEVE, Conch. Icon. pi. 62, f. 429. BuUmulus pseudosuccineus 



BECK, Index, p. 64. CLESSIN, Mai. Bl. (n. F.) x, 1888, p. 166 



Succinea moricandi PFR., Symbolae ad Hist. Hel. ii, p. 131. 



Much more elongated, and of a more milky tint than S. citrino- 

 vitrea. As in S. boissieri, there is a slightly indicated keel at the 

 periphery. This species is the type of the section Eudioptus, and 

 has hitherto been referred to Balimulns. Its affinities, however, are 

 with the following species : 



S. CITRINOVITREA (Moricand). PI. 64, figs. 96, 97. 



Shell minutely perforate, ovate-conic, thin and transparent, the 



