STROPHOCHEILUS-BORUS. 25 



with a slight thickening within, above the middle; columella short, 

 very concave and pink below, broadly spreading in a translucent- 

 white callus over the umbilical tract and parietal wall, usually with 

 a thickening (hardly a lump) above, remote from edge of callus. 



Alt. 128, diam. 80; aperture alt. 69, width 54 mill. 



Alt. 116, diam. 62; aperture alt. 59 width 44] mill. 



Rio Janeiro (Marten set a/.) ; New Freiburg (Bescke) ; St. Sebas- 

 tiano, on the coast S. of Rio (Spix) ; Prov. Balna (Spix) ; Bahia 

 (Anthony) ; near Petropolis (A. D. Brown). 



Helix ovata MULLER, Hist. Verm, ii, p. 85. Helix ovalis GMEL., 

 Syst. Nat. 13, p. 3637. If. (CocA%e?m) ovata FER., Hist. pi. 146, 

 147. Bulimus ovatus BRUG., Encycl. Meth. i, p. 318. PFR., Mon- 

 ogr. ii, p. 19. REEVE, C. Icon. f. 212. MARTENS, Novit. Conch, v, 

 p. 14. HIDALGO, Viaje al Pacif. p. 47. B. ovum H. & A. AD., Gen. 

 Rec. Moll, ii, p. 146. B. hcemastomus SWAINS., Malacol. p. 178, fig. 26. 

 Strophocheilus hcemastomus SPIX, Test. Brasil. p. 12, pi. 11, f. 1. 



This is one of the best-known species, readily recognized in typical 

 specimens by the strong, glossy, rich dark chestnut epidermis with 

 numerous darker and yellowish streaks, the narrow aperture, rather 

 straight, pink or pink-edged outer lip, translucent edged parietal 

 callus, always thinned-out at the edge, etc. Moreover, the lip is 

 broadly reflexed, recurved ; and the columella is narrowly, abruptly 

 curved toward its base, and the broad spread of its reflexion extends 

 lower than in other forms. A very sparce, minute granulation 

 sometimes extends over the earlier half of the body-whorl. 



Vnr. chionostomus Morch. PL 21, fig. 49. 



Form, sculpture and marking exactly as in the type, or shell 

 somewhat more lengthened ; but cuticle thinner, yellow with dark 

 stripes; peristome snow-white (whence the name); shell-substance 

 under the cuticle white, the earlier whorls white or delicate pink. 



Macahe, Brazil (Paz, Martinez). 



Bulimus chionostoma MORCH, Catal. Yoldi, (1852), p. 27 (no 

 description ; refers to " Variat rarior peristomate albo" Pfr., Mon- 

 ogr. ii. p. 20). B. ovatus var. chionostomus MART., Novit. Conch, v, 

 p. 15. 



I cannot follow von Martens in quoting here Ferussac's plate 160, 

 f. 11, 12, without a "?". Those figures are by no means typical 

 chionostomtis. A number of specimens of this white-mouthed variety 



