SIMPULOPSIS. 221 



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



limpida, p. 223. 



a*. Diameter of shell f to f its length ; ovate-conic ; whorls 5 ; 

 periphery rounded. citrinovitrea, p. 221. 



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



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



mill. boissieri, p. 222. 



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



S. PSEUDOSUCCINEA (Moricand). PI. 04, figs. 4, 5. 



Shell im perforate, oblong-ovate, (Swccz'weo-shaped, very thin and 

 fragile. Decidedly translucent, tlie columella visible through the 

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

 slight growth-wrinkles, nepionic 1^- whorls with excessively fine, 

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

 about -H, 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 (rend 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 pseudosucciiiea MORICAND, Mem. Soc. Pliys. et d' Hist. Nat. 

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

 cinea DESII. in Lam., Auim. 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, 81); viii, 125 ; Concliyl. Cab. p. 216, pi. 60, f. 5, 6 



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



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



Sticcinea moricandi PFR., Symbol* 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 Bnlimulns. Its affinities, however, are 

 with the following species : 



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



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



