STREPTOSTYLA. 157 



half the length, moderately solid though thin, pale greenish 

 yellow or yellowish green, glossy. About 2% apical whorls 

 are smooth, then fine irregular striae begin, and the sutural 

 margin becomes distinct. On the last two whorls this border 

 is pale, nearly smooth, and limited by an impressed line ; the 

 striation below it being sharp and strong, but rapidly fading 

 out downwards, very weak on the middle and base. The 

 aperture is vertical, fleshy-whitish inside. The outer lip 

 arches forward a little in the middle. The columella is very 

 strongly twisted, a strong lobe projecting into the aperture, 

 and moderately calloused at the edge. Length 17, diam. 9.5, 

 aperture 11 mm. ; whorls G 1 /^- 



Costa Rica : Hills of Uren (Gabb), type in coll. A. N. S. P. 



S. viridula ANGAS, P. Z. S. 1879, p. 482, pi. 50, f. 12. 

 MARTENS, Biologia, pp. 98, 616 (numerous Costa Rican local- 

 ities). 



A remarkably obese species, one of the widest known to 

 me, and further distinguished by its distinctly striate upper 

 surface and greenish-yellow color. As the original account 

 is rather unsatisfactory I have redescribed and figured the 

 type specimen. 



31. S. PLICATULA Strebel. Vol. I, p. 47. 



32. S. BICONICA (Pfeiffer). PI. 29, fig. 79. 



Shell subfusiform, conically tapering both above and below, 

 rather solid, smooth, glossy, pale reddish-corneous. Spire 

 conic, rather acute ; suture margined. Whorls 7, slightly con- 

 vex, the last slightly longer than the spire, markedly tapering 

 to the base. Columellar lamina callous, twisted, not truncate. 

 Aperture subvertical, extremely narrow, acuminately oblong ; 

 peristome simple, the right margin strongly arched forward. 

 Length 13.5, diam. 6, aperture 8x1.66 mm. (Pfr.). 



Southern Mexico: Chiapas ( Ghiesbreght, in Cuming coll.) . 



Spimxis Uconica PFR., P. Z. S. 1856, p. 378; Malak. Bl., iii, 

 p. 233 (1856) ; Monogr., iv, 578.Streptostyla b. PFR., MAR- 

 TENS, Biologia, p. 98, pi. 5, f. 17, 17a. 



Figured by von Martens from a specimen in the collection 



