358 PETTERD: ON HELIX WELDII. 



or thickness of the upper junction of the peristome. 



At present I possess several hundred of these hybrids, all 

 furnished with this peculiar dentiform lamellum." 



NOTE ON HELIX WELDII Woods. 

 By W. F. PETTERD. 

 This extremely minute species is of great interest, as it is 

 the only sinistral Helix hitherto discovered in Australia. Among 

 our numerous species of Helix there are one or two that come 

 somewhat near it in general characters, yet it is nevertheless very 

 distinct and it is invariably reversed. Its habitat is very restricted, 

 being only found, as far as at present known, in one locality, at 

 the foot of the high rocks near the township of Stanley, Circular 

 Head, Northwest coast of Tasmania. In habitat it is somewhat 

 peculiar, as it is only to be obtained on the upper surface of blocks 

 of rock that are overgrown by a thick mass of vegetation, associat- 

 ing with two or three larger species of the same genus. It is 

 somewhat abundant, and generally a number are found clustering 

 together in the same crevice or indentation of the rock. 



: B I B L I O G R A P H Y. 



18 78. 



Bellardi (Prof Luigi).— New Fossil Genus of Bullidse 

 from Piedmont and Liguria. — Descrizione di un nuovo 

 genere della famiglia delle Bullide fossile del terreno plio- 

 cenico inferiore del Piemonte e della Tiguria. — Bull. Soc. 

 Mai. Ital., 1876, ii., pp. 207 to 210 and tav. C, fig. 5, 6, 7, 8. 

 The new genus is named Sabatia, instituted for the recep- 

 tion of 6". Isseli Bellardi 1^ = Bulla plicata Bellardi, non Deshayes). 



