38 EUONYMA. 



Natal: Durban (Burnup). 



Hypolysia florenticc M. & P., Am. Mag. N. H. (7), viii, 

 1901, p. 318, pi. 2, f. 8; (7) xii, p. 596, pi. 32, 1 13. 



The figure shows no trace of columellar truncation, at 

 least in a front view. 



Genus EUONYMA Melvill & Ponsonby. 



Euonyma M. & P., Annals and Magazine of Natural His- 

 tory, 6th ser., xviii, p. 316 (Oct., 1896), for Subulina lao- 

 cochlis. 



Rather large, slender Stenogyroid snails with the apex 

 rounded, hemispherical and smooth, not deciduous; whorls 

 numerous, striate or smooth; texture as in Opeas, or more 

 solid. Aperture ovate, columellar lip reflexed, adnate or 

 leaving an umbilical crevice, the columella concave or 

 straight, not truncate, continuous with the basal lip ; outer 

 lip sample. Egprs globular, as in Opeas, Subulina, etc. Type 

 E. laococlilis. 



Distribution, South Africa ; one species from as far north 

 as Ussambara. Illustrated on plate 10. 



This genus was proposed, without definition, for a single 

 sinistral species, which in all other characters agrees with a 

 somewhat numerous group of South African snails which 

 have been referred by Melvill and Ponsonby to Subulina, 

 and by Sturany more correctly to Opeas. From the latter 

 group they differ chiefly by the larger size and general 

 aspect, which is quite that of the typical American Steno- 

 gyra, a group practically identical with Euonyma concholog- 

 ically. Euonyma is kept separate from Stenogyra solely by 

 the diverse distribution, Stenogyra in the restricted sense 

 comprising only tropical American species. 



As an abstract proposition, I do not favor the separation of 

 genera purely upon the ground of diverse geographic distri- 

 bution. But the South African fauna is so totally unlike the 

 tropical American that it seems likely when a careful com- 

 parison of the whole structure can be made, that some differ- 

 ences of generic value will be found between Euonyma and 

 Stenogyra. 



