560 ON A COLLECTION OF LAND AND FRESH WATER SHELLS, 



predecessor in width ; spire regularly tapering ; apex obtuse ; 

 sculpture close, oblique, sharp, threadlike longitu- 

 dinal riblets, the first 2 whorls smooth, the third 

 lightly ribbed; suture deeply impressed; umbilicus 

 spiral, wide and shallow externally, deep and 

 narrow within, ridged around the margin ; aper- 

 ture almost detached from the body whorl, vertical, 

 circular, furnished with but one canal, which is 

 small, shallow, and cut half across the left side 

 of the peristome, its position coinciding with the termination 

 of the circum-umbilical ridge, peristome reflected and expanded, 

 broad anteriorly, narrow near the body whorl. Operculum not 

 collected. Length 6, breadth 3 mm. 



Hob. — Rejectamenta of a stream nine miles north of Gympie 

 and at Calliungal ; dead shells only (Musson). 



Type in Australian Museum. 



This remarkable shell differs widely from any known form. P. 

 coxi, planilab?'is, and jietterdi share its peculiar sculpture, but the 

 lack of the anterior canal as well as its smaller size distinguish it 

 from those species. Having the general appearance of Bellar- 

 diella, it wants the distinctive feature of bearing the inferior 

 canal, " externe et pone peristome haud in peristomate." 



Scarce. 

 Mt. Archer. 



P. ventrorsa, Dohrn. 



P. meridionalis, Pfeiffer, 

 Amongst stones in damp gullies. 

 Mt. Archer, Olsen's Caves and (c). 



P. wilcoxi, Cox. 



In rotten wood and under the bark stripped from the Araucaria 

 pines by the timber-getters. 



Miriam Vale, Warro, Mt. Archer, Cania, Kenilvvorth, Gympie 

 (a), Caboolture and the North Pine River. 



