38 OX'ILIOIDEK OF TROPICAL AMERICA. 



Indica, p. 41, pi. 102, f. 10, copied in my fig. 61 of plate 4); 

 while the figure given by Paladilhe, which I have copied, seems 

 to belong to C. (Geostilbio.') balanus. Further investigation of 

 the Csecilioides of Aden and India is much needed. Whether 

 the observed differences in the columella indicate several species, 

 or are extreme aspects of variation in a single stock, are ques- 

 tions I can throw no light upon. 



Species of tropical Asia, Went Indies, etc. 



Tropical countries have a few species of Csecilioides of two 

 groups: (1) the group of C. iota, comprising very minute species 

 1.6 to 2.5 mm. long, markedly cylindric, with the whorls nearly 

 flat. All are American. (2) the group of C. gundlachi, with 

 the shell larger, usually 3 to 5 mm., composed of convex, very 

 obliquely coiled whorls. The columella is only quite obsoletely 

 truncate. These groups are known as Caecilianopsis and 

 Geostilbia. 



Section C^ECILIANOPSIS Pilsbry. 



Cacilianopsis PILS., Nautilus xxi, July, 1907, p. 28, for 

 (,'. jod = C. consobrina veracruzensis. 



Minute (1.6 to 2.5 mm. long), cylindric-oblong, the spire 

 short, wider than in Cacilioides. Columella varying from 

 abruptly truncate to very obsoletely so. Tropical American. 

 Type C. consobrina veracruzensis. 



37. C. IOTA (C. B. Adams). PI. 4, figs. 67, 71, 72. 



Shell minute, slender, corneous; whorls 4, very wide, smooth; 

 aperture long, very acute above; columella arcuate. Divergence 

 12 degrees; length of spire .08, total length .135, width .045 

 inch. (Ad. ). 



Jamaica (C. B. Adams): Bellevue, (Gloyne, in Swift Coll.); 

 Yallahs (Gloyne). 



Achatina iota C. B. AD., Proc. Bost. Soc. N. H. 1845, p. 13.- 

 PFR., Monogr. ii, 295; iii, 506; iv, 626; vi, 241; viii, 297; 

 Conchyl. Cab. p. 355, pi. 29, f. 18, 19 (bad). GLOYNE, Journ. 

 de Conchyl. xx, 1872, p. 32. 



The type lot at Amherst consists of three specimens. It is a 



