158 STREPTOSTYLA. 



of the late Mr. Albers, who had it probably from Pfeiffer 

 himself. 



33. S. GABBI Pilsbry, n. sp. PI. 30, figs. 2, 3. 



The shell is very thin, oblong, orange-brownish, slightly 

 paler on the spire, glossy and smooth except for very weak 

 growth-wrinkles. Whorls nearly 5%, the first very small at 

 the tip, then suddenly enlarging, the rest slightly convex, 

 regularly increasing, the latter half of the last whorl de- 

 scending more rapidly. Suture lightly impressed, delicately 

 edged with a white line, which fades below into a very nar- 

 row dark border. The last whorl has evenly convex sides. 

 Aperture lanceolate, the outer lip only very slightly arched 

 forward. Columellar fold thin and sharp, moderately twisted. 

 Length 22, diam. 10 mm., length of aperture 15.8 mm. 



Costa Rica: on the ridge between Tilorio and Zorquin 

 (Gabb). 



Streptostyla boucardi Pfr. var.( ?) ANGAS, P. Z. S. 1879, p. 

 482. S. boucardi TRYON, Manual, vol. i, pi. 10, f. 72. 



This species is related to S. shuttleworthi, but it is shorter 

 and broader, the last whorl being more inflated; the color is 

 darker and uniform. Angas thought to unite it as a variety 

 to S. boucardi Pfr., but that form, though smaller, has six 

 whorls, and the aperture is decidedly shorter. 



Gabb describes the living unimal as "light brown above, 

 whitish below and posteriorly ; tentacles dark brown ; carries 

 the tip of the tail slightly turned up in travelling." His 

 original sketch in color is reproduced in fig. 2. 



34. S. FLAVESCENS (Shuttl.). Vol. I, p. 48. 



34a. S. FLAVESCENS var. boucardi (Pfr.). PL 29, fig. 83. 



The figure is a copy from von Martens of a sketch of the 

 type drawn by Mr. Edgar A. Smith. Tryon 's figure in vol. I 

 does not represent boucardi, but a different species collected 

 by Gabb in Costa Rica. 



35. S. FULVIDA C. & F. Vol. I, p. 46. 



36. S. GLANDIFORMIS C. & F. Vol. I, p. 46. 



