98 DRYM^EUS LE10STRACUS. 



The species upon which Moricand inflicted the more than sesqui- 

 pedalian name of cinnamomeoUneatus is usually somewhat smaller 

 than any of the preceding, and streaked rather than striped with cin- 

 namon brown, or with the streaks obsolete. The peripheral keel, 

 while so slight as to hardly affect the rotundity of the last whorl, is 

 still quite perceptible. 



I consider the locality, Guiana, given by Troschel on the evidence 

 of specimens collected by Schomburgk, as in all probability erron- 

 eous. Troschel's investigation of the teeth was made on Schom- 

 burgk's material, so that this citation also is open to doubt. See 

 Schomburgk's " Reisen in Britisch-Guiana," vol. iii, p. 546. Drouet 

 quotes the species, on the authority of Schomburgk, in his French 

 Guiana catalogue. 



D. PERLUCIDUS (Spix). PI. 14, figs. 21, 22. 



Shell perforate, pyramidal, thin but moderately strong ; subtrans- 

 lucent opaline white throughout, or with the tip of the spire red-brown. 

 Surface smooth except for slight oblique growth lines and in places 

 some nearly obsolete short spiral impressions. Spire long-conic with 

 straight lateral outlines, the apex somewhat obtuse, usually with a 

 minute terminal dark spot. Whorls 7 to 7^, the first smooth, the 

 rest slightly convex, last whorl decidedly keeled at the periphery, mod- 

 erately convex above and below the keel. 



Aperture small, oblique, ovate ; peristome narrowly expanded at 

 the edge, the columellar margin triangularly reflexed above. 



Alt. 23^, diam. 12^, length of aperture 10 mill. 



Alt. 21, diam. 11, length of aperture 8f mill. 



Province of Bahia, Brazil (Blanchet, Will). 



Bulimus perlucidus SPIX, Test. Bras. p. 7, pi. 7, f. 2 (1827). 



DESH. in Lam. An. s. Vert., viii, p. 248 PFR., Monogr. ii, p. 204 ; 



iv, p. 405 ; vi, p. 51. Bulimulus perlucidus BECK, Index Moll. p. 



67 DOHRN, Jahrb. d. D. Malak. Gesellsch. x, 1883, p. 351 



Bulinus opalinus Sows., Conch. Illustr. f. 47; Beechey's Voy. 

 "Blossom," p. 144, pi. 38, f. 8. Bulimus opalinus PER., Monogr. 

 ii,p. 107; iii, p. 347. REEVE, Conch. Icon. pi. 58, f. 394 HI- 

 DALGO, Journ. de Conch. 1870, p. 47. Helix (Cochlogena) angulosa 

 FER., Prodrom. p. 54, no. 402 (according to Beck) MORICAND, 

 Mem. Geneve vii, 435 Bulimulus angulosus BECK, Index Moll. p. 

 64 Liostracus angulosus, FFLD., Verh. Zool.-bot. Ges. Wien, xix, 

 1869, p. 874. 



