C.ECILIOIDES OF TROPICAL AMERICA. 39 



Bubcylindric shell, obtuse at both ends, of scarcely four whorls 

 in most examples, 4-| in the longest. The shell is clear corneous 

 when fresh, showing the internal walls through, but it weathers 

 to milky white. The whorls are only slightly convex, and are 

 separated by a moderately impressed suture, margined below. 

 The suture is at first nearly horizontal, but at the last 1 or 

 2 whorls it descends rapidly, the width of the whorl progres- 

 sively increasing. The aperture is acuminate above. Outer lip 

 arches very strongly forward. The columella is more or less 

 concave below, and is rather abruptly truncate above the base. 

 Columellar callus usually moderate, but variable in thickness. 

 Under a high power, an extremely minute spiral striation may 

 be seen near the base. Measurements are as follows: 



Cotype, Adams coll.: length 1.75, diam. .5 mm. 



Bellevue; fig. 72: length 2, length aperture 0.8 mm. 



Fig. 71: length 2, diam. 0.6, aperture 0.75 mm. 



Fig. 67: length 1.65, diam. 0.5, aperture 0.75 mm. 



C. iota has been found only in Jamaica. It is readily dis- 

 tinguished from other tropical-American species by its much 

 narrower contour. Exact measurements which I have made of 

 a large number of specimens from several localities show the 

 difference in shape to be constant. 



Pfeiffer's figure of this species in the Gonchylien Cabinet is very 

 poor. It shows no columellar truncation, and hence C. iota 

 was classed by Crosse and others in Geostilbia. Adams's type 

 specimens, as well as numerous examples before me, have a 

 distinctly truncate columella. 



38. C. CONSOBRINA (Orbigny). PI. 5, figs. 81, 82. 



Shell oblong-fusiform, subcylindric, pellucid, glossy, white; 

 spire of nearly equal diameter to the end, very obtuse. Whorls 

 5, very slightly convex, the last oblong. Aperture ovate-oblong; 

 columella twisted, truncate. Length 2, diam. f mm. (Orbigny). 



Cuba: in the interior (Sagra); coffee plantation Fundador 

 near Matanzas among dead leaves (Gundlach, type loc. of A. 

 pygmaa}. 



Achatina consobrtna ORBIGNY, Historia fisica, politica y natural 

 de la isla de Cuba, v, Moluscos, p. 89, pi. xi 6?X f. 10, 11, 12, 



