27 



ON SOME LAND SHELLS FROM TRINIDAD. 



By EDGAR A. SMITH. 



(Read before the Society, July 14th, 1897.) 



Since the publication in this Journal (1) of "A List of the Land and 

 Freshwater Mollusca of Trinidad," a few additional species have kindly 

 been brought to my notice by Mr. J. H. Ponsonby, who obtained them 

 during a recent visit to the island, in conjunction with Mr. Lunt, of 

 the Botanical Gardens at Port of Spain. They are as follows : — 



I. Vitrea lunti, n. sp. (figs, i, 2). 



Testa minuta, discoidea, aperte umbilicata, tenuis, pellucida; spira 

 paulo data, ad apicem obtusa ; anfractus 4^ convexi, sutura profunda 

 sejuncti, striis spiralibus aliisque transversis microscopice cancellati ; 

 apertura obliqua, lunata ; peristo?na tenue, margine columellari hand 

 reflexo. Diam. maj. \\ mm., alt. f. 



Chiefly characterized by the convex whorls, deep suture, open 

 umbilicus and microscopic cancellation of the surface. 



■ — - : J^|/ 



2. Sophina trinitaria, n. sp. (figs. 3, 4). 



Testa minuta, anguste perforata, orbicularis, supra obtuse conoidea, 

 vitrea, tenuis, pellucida, polita ; anfractus 4^ convexiusculi, lente accres- 

 centes, infra suturam zona hyalina leviter concava marginati, lineis 

 incrementi tenuissimis sculpti ; ultimus infra in medio impressus, in 

 umbilico angustissimo carina acuta, intrante usque ad columellam 

 continua, instructus ; apertura oblique lunata; peristoma tenue, margine 

 colwnellari anguste reflexo. Diam. maj. 2\ mm., alt. x\. 



At once distinguished from all the other similar species from 

 Trinidad by the keel within the umbilical perforation. This is a third 

 instance of the occurrence of Indian forms in Trinidad, the others 

 being Ennea bicolor and Diplommatina occidentalis. The question 

 arises — Are all three importations ? 



(1) Vol. 8, pp. 231 — 251, 



