42 C^KCILIOIDES OF TROPICAL AMERICA. 



Malac. Soc. Lond. i, p. 308 (St. Vincent). Ca>cilianella rn,, 

 BROWN, J. of Conch, x, 1903, p. 269 (Barbados). 



Crosse has very inadequately figured minutissima, and I have 

 copied his figure, pi. 5, fig. 80. Figure 84, pi. 5, and fig. 68 of 

 pi. 4, represent what I take to be Guppy's species from 

 Barbados. The general form is as described for pygmaa-, but 

 the surface is smoother than in Cuban or Mexican shells, spiral 

 lines being scarcely visible under the compound microscope 

 except at the base. The columellar truncation is rather weak. 

 Two specimens measure: Length 2.05, diam. .7 mm., whorls 5. 

 Length 2.15, diam. .8, aperture 9 mm.; whorls 5. 



With these specimens were others resembling them except 

 that the columella is very strongly truncate at the base (pi. 5, 

 figs. 83, 85) at all stages of growth. These may represent 

 another species, yet I am unable to satisfactorily separate the 

 series. The two examples figured measure: length 2, diam. .7 

 mm. (fig. 83); length 2.3, diam. .75 mm., whorls 5J (fig. 85) , 



Geostilbia mazei seems to me to be identical with minutmima. 

 The original description follows. 



Geostilbia mazei 'Crosse' Maze. PI. 5, fig. 75. " Shell im- 

 perforate subcylindric, very thin, smooth, cr}*stalline, hyaline 

 unicolored; spire rather long, the apex somewhat obtuse; suture 

 impressed. Whorls 4, slowly increasing, the last a little 

 shorter than the spire, rounded at the base. Aperture piriform ; 

 peristome simple, the margins thin. Length 2.5, diam. . mm. 

 Animal of a yellow color" (Maze). 



Guadeloupe: Vieux-Fort, southeastern slope of the Morne 

 Houelmont at about 270 meters (E. Marie). 



Geostilbia mazei Crosse Mas., MAZE, Journ. de Conchyl. xxxi, 

 1883, p. 7, pi. 1, f. 2. 



39. C. BLANDIANA Crosse. PI. 4, fig. 64. 



Shell imperforate, long-fusiform, very thin, polished, very 

 transparent, hyaline. Spire rather long, the apex obtuse, 

 rounded; suture impressed. Whorls 4J, a little convex, the 

 last shorter than the spire, rounded at base. Aperture sub- 

 pirifonn; peristome simple, the margins joined by an incon- 

 spicuous, very thin callus; columellar margin slightly thickened, 



