FEESHWATEB SHELLS OP ATTSTEALIA. 291 



Suture with a fine white line beneath. "Whorls 4^-5 ; three first 

 very small, only a little convex, penultimate very swollen ; last 

 rather inflated above, subcylindrical. Sculpture consisting of 

 lines of growth strongly decussated by spiral, more or less punc- 

 tured, striae. Aperture narrow, occupying rather less than two 

 thirds the entire length of the shell, broadly margined with 

 brown within the lip ; the latter is oblique, a little arched in 

 the middle, and faintly sinuated towards the suture. Columella 

 oblique, straightish, with only a slight and not prominent twist. 



Length 15 millim., greatest diameter 8 ; aperture 8-| long, 

 3-|- wide. 



Hal. King Greorge's Sound, South-west Australia {Brazier). 



This species is peculiar on account of its remarkably small 

 apex, the bulging nature of the penultimate whorl, and the dis- 

 tinct decussated sculpture. The latter characteristic and the 

 smaller size separate it from the P. proteus. P. tenuistriata 

 appears to be similarly sculptured ; but broader, longer in the 

 aperture, and the whorls are said to be " slightly angular," a 

 feature entirely absent in the present species. 



91. Phtsa tenuilieata, n. sp. (Plate YI. fig. 27.) 

 Shell acuminately ovate, olivaceous horn-colour, usually with 

 one or more periodic yellowish stripes upon the last whorl. 

 Volutions 5, convex ; three apical ones small, stained with dark 

 brown, penultimate suddenly and comparatively larger ; last 

 elongate, rapidly descending. Sculpture consisting of lines of 

 growth, and very distinct and elevated spiral Avavy lines, which 

 vary considerably in number in diff'erent specimens. Aperture 

 narrow, exhibiting a buff or yellowish thickened ridge within the 

 labrum, and generally another further within, occupying about 

 five eighths of the entire length of the shell. Columellar fold 

 scarcely defined ; the callosity reflexed, whitish. 



Length 12 millim., greatest diameter 6, 

 ' Hah. Swan Eiver, W. Australia {Mus. Cuming.) ; Perth {Pet- 

 terd). 



There are several specimens of this species in the Museum, all 

 exhibiting about the same relative |)roportious with regard to the 

 length of the aperture and the total length. An example from 

 Perth sent to me lor examination by Mr. J. "W. Taylor of Laeds 

 has, however, the spire unusually elongated, so that the aperture 

 occupies scarcely more than half the entire length. 



