642 



MB. E. A. SMITH 0?r TWO KEW SPECIES OP ENNEA. [NoV. 7, 



4. Descriptions of two new Species of Shells of the Genus 

 Ennea. By Edgar A. Smith, 



[Received August 28, ]893.] 



Ennea (Ptychotbema) bassamensis. (Woodcut, fig. 1.) 



Testa elonr/ata, jniinformis, alhida ; anfractus 8-9, conve.vhisculi, 

 siitura iirofunda paulo ohliqua sejuncti, costulis confertis Jili- 

 formihus obliquis instructi, ultimus postice ad hasin hi-scrohicu- 

 lahis^jyrope labrum hrevitcr ascendens ; apeHura alba, rotunde 

 qtiadrata, lon^it. totius ^ adcvquans, jj^t'cw et denticulis 

 incequalibus rinrjens, plica parietali valida lamelliformi intranie, 

 denticulis trihus columellaribus, unico basali minimo, liris 

 incequalibus quatuor, lamella uiiica et denticulo intra labrum 

 munita ; peristoma leviter incrassatum, reflexuin, album, nitens, 

 marginibus callo tenui junctis. 



Longit. 15 millim., diam, 5; apertura 4| Tonga, 3| lata. 



Hab. Abidjeau, Grraud Bassam, West Africa. 



The first four whorls are rather more convex than the rest, 

 almost smooth, and destitute of the fine oblique lirse which orna- 



Kg. 1. 



Ennea {Ptychotrema) bassamensis. 



ment the rest of the shell. The upper edge of these whorls has a 

 narrow pellucid margination and appears crenulated. The denti- 

 tion of the aperture is best explained by means of a figure (fig. 1 h). 



Ennea cyatliostoma, Pfr., from Old Calabar, is closely allied to this 

 species, but differs in its superior size and the dentition of the 

 aperture. 



Fig. 1 e represents the young state of this species, in which 

 the armature of the aperture is quite different from that of the 

 adult form. 



