212 GUPPY : MOLLUSCA OF TRINIDAD. 



A. lowei Paiva, 'J. de C.,' 1866, p. 339, pi. xL, f. i, Madeira. 



A. balanus Bens. {Ccecilianella isseli Pal.), Aden, etc. 



If any validity is to be assigned to the genus Geostilbia, our 

 present shell may probably be found to be a member of it, and 

 perhaps synonymous with G. biafzdiana Crosse, and, further 

 again, even with Achatina iota Adams, and G. inazei Crosse. 

 It is, I think, likely that Geostilbia may take rank as a sub- 

 genus of Ciondla. 



2. Spiraxis simplex Guppy. 



Crosse, ' Journ. de Conch.,' Jan., 1890, p. 37, No. 4. 



A turreted longitudinally sinuate-plicate shell of eight or 

 nine whorls, white, under a light straw-coloured epidermis. 

 Length 12 — 15 mill., diameter 4 — 6 mill. 



This shell, which is rather rare, is a great deal like a large 

 Stenogyra, but it has the sinuate outer lip and the twisted 

 columella ascribed to Spiraxis. It is much larger than its 

 congeners swiftiana and paupermla, but it is smaller than Sp. 

 dunkeri Pf. (Haiti). 



3. Stenogyra octona Chemn. 



Crosse, I.e., p. 44, No. 25. 



Mr. Edgar A. Smith remarks (in Ann. & Mag. Nat. Hist., 

 Sept., 1891, p. 253,) on the wide distribution of this shell, which 

 is found in all, or almost all, the West Indian Islands, over a 

 large part of tropical America, and in some of the Polynesian 

 Islands. Specimens from Central Africa and Madagascar seem 

 identical also. On this subject see Adams, ' Contributions to 

 Conchology,' 1849, p. 48. It is probable that some shells 

 described' under other names (e.g. Stenogyra Jimuritiana VLnd 

 St. inainillata) are identical. Among those whose distinctness 

 is doubtful I would include St. striatella Rang, and St. tere- 

 braster Lam., though the latter is indeed placed in a different 

 section by Albers and Von Martens. 



J.C. , vii., Jul}- 1893. 



