STROPHOCHEILUS. 



Aperture over half the shell's length, nearly vertical, bluish-white 

 inside; perixtome rose-red, abruptly, flatly reflexed (the whorl con- 

 tracted behind it), outer lip bearing a small, flat-topped tooth in the 

 middle. Columella reflexed, rather narrow ; parietal callus roseate. 



Alt. 66, diam. 33 ; alt. of aperture 37 mill. 



Alt. 60, diam. 29 ; alt. of aperture 32 mill. 



Brazil; near New Freiburg. 



B. planidens MICH, in Guerin's Mag. de Zool. 1831, pi. 31. 

 DESK, in Lam., An. s. Vert. p. 239 ; in Fer., Hist. p. 38, pi. 143, f. 4, 

 5. KUSTER, Conchyl. Cab. p. 17, pi. 3, f. 1. REEVE, Conch. Icon. 

 pi. 31, f. 190. PFR., Monogr. ii, p. 54 ; vi, p. 23. Helix planidens 

 RANG. 



Specimens occur with the tooth of the outer lip much reduced or 

 even absent; but these are still readily distinguished from S. milleri 

 by the flat lip, contraction of whorl behind it, less oblique columella 

 and lack of satin zones. There is occasionally a very slight retic- 

 ulate malleation on the back. 



S. RHODOCHEILUS Reeve. PI. 22, fig. 53. 



Shell scarcely perforate, ovate-oblong, solid, minutely decussate- 

 granulate, shining ; chestnut colored, elegantly decorated with light- 

 ning-streaks and triangular spots of golden. Spire convex-conic, the 

 apex obtuse. Whorls 5, first subplanulate, penultimate more con- 

 vex, the last whorl obliquely descending, longer than the spire, 

 hardly attenuated toward the base. Columella somewhat folded, re- 

 ceding, whitish. Aperture a little oblique, obloug-semioval ; per- 

 istome deep rose color, expanded and reflexed throughout. Alt. 55, 

 diam. 25 mill. : alt. of aperture with peristome 31, width 21 mill. 



Brazil. 



B. rhodocheilus REEVE, Conch. Icon. pi. 28, f. 173. PFR., Mon- 

 ogr. iii, p. 315. 



I have not seen this form, which seems most nearly allied to S. 

 planidens. 



S. MILLERI Sowerby. PI. 22, figs. 54, 55. 



Shell nearly imperforate, ovate-oblong, rather solid, shining; 

 chestnut or olive-brown, darker on spire; surface with the sheen of 

 watered silk or satin, having spiral zones of changeable luster. Sur- 



