164 



DESCRIPTIONS OF TWO 

 NEW SPECIES OF PATULA FROM ST. HELENA. 



By EDGAR A. SMITH, F.Z.S., 

 Zoological Department, British Museum, London. 



The first of the species about to be described formed part of the 

 collection of the late M. Emile Eudel, and was kindly submitted to 

 me for examination by Mr. H. Fulton. In my report upon the land 

 shells of this island 1 twelve species of this genus are enumerated, four 

 without teeth in the aperture and eight with teeth (Endodonta). Of 

 the latter, only a single species is recent or living, the rest belonging 

 to the extinct or sub-fossil fauna. The discovery of additional 

 existing forms is therefore especially interesting. Helix cutteri of 

 Pfeiffer, the only living species previously recorded, is somewhat 

 larger than either of those here described, and has a different 

 armature to the mouth. 



Patula (Endodonta) sexdentata, sp. nov. 

 Testa parva, perforata, depresse conoidea, tenuis, nitida, 



straminea, superne rufo tessellata, sitbtus rufo fulgurata ; 

 aujractus 5, com ex i, lente crescentes, duo pri/ni Icevigati, 

 caiteri costulis tenuissimis arcuatis striisque micro- 

 scopicis intercalatis sculpti, ultitnus ad peripheriam 

 rotundatus, hand descendens ; apertura lunaris, obliqua, 

 lamellis duobus parietalibus, tenuibus sed prominentibus, 

 intrantibus, tribus dentiformibus pi-ope cohtmellam, et 



una gracile pama in medio palati, instructa ; perist. tenue, 



marginibus remotis, columellari dilatato et subreflexo. Diam. 



max. 3§ millitn., in in. 3^; a it. i\. 



Habitat. " Dans le cresson de l'lle Ste. Helene " (Eudel). 



This species agrees rather closely with P. pseustes, Smith, in 

 respect of the dentition of the aperture. The palatal lamella, 

 however, in that species is considerably stronger, and the form of 

 the shell is very different. P. cutteri has two similar parietal 

 lamellae, only two basal denticles, and no palatal lamella. In other 

 respects it appears to be very similar, but a trifle larger. Water- 

 cresses {Nasturtium officinale) among which it is stated by M. Eudel 

 that this species occurs, are said to be " very common in the ravines 

 and along the mountain streams and ponds." 2 



'Proc. Zool. Soc, 1892, pp. 258-270. 

 - Mellis, J. C. St. Helena, p. 237. 



