FEESH^ATEE SHELLS OF AVSTEALIA. 285 



arcuate and prominent in the middle, a little sinuated near tbe 

 suture, and receding towards the base. Columellar twist thin- 

 nish, moderately prominent, covered with a greyish callosity, 

 which is reflexed in the umbilical region and extends to the lip 

 above. 



Length 18 millim., greatest diam. 7^; aperture 8-i- long, 3i 

 wide. 



Sab. Townsville, Queensland (Peftard); Cleveland Bay 

 Queensland {Braziej-); Clarence River, N, S. Wales {Strange). 



Both those from the latter locality in the Cumingian Collec- 

 tion and the three specimens sent by Mr. Brazier are covered 

 with a very black earthy deposit. P. acutispira, Tryon, is a 

 smaller species with a much shorter spire. The spiral stri^ vary 

 in distinctness, in some examples being scarcely observable. lu 

 Messrs. Taylor and Nelson's figure the whorls are rather too 

 convex. 



79. Phtsa geacilenta, n. sp. (Plate VI. fig. 20.) 



Shell narrow, elongate, yellowish horn-colour, sometimes striped 

 at intervals with opaque yellow periodic marks of growth upon the 

 last whorl. "Volutions 6, a little convex, regularly but rapidly 

 enlarging, very faintly constricted beneath the suture, striated by 

 the lines of growth and minute interrupted stride in the same 

 direction, which give the surface a very finely wrinkled appear- 

 ance, visible only under a lens. Aperture narrow, inversely auri- 

 form, pale bluish or pinkish white within, generally less than half 

 the length of the shell. Columellar fold distinct, thickisb, united 

 to the upper termination of the outer lip by a thin callosity. 

 Labrum, viewed laterally, much curved in the middle, slightly 

 sinuated close to the suture, and very receding at the lower 

 part. 



Length 16 millim., greatest width 6. 



ILa}). Endeavour Creek or Eiver, Queensland. 



This species is of a more opaque texture than P. Beddomei, and 

 has fewer and more rapidly enlarging whorls. It is also of a 

 diflFerent colour, has a less shining surface, lacks the brown stain 

 at the base of the last whorl seen within the aperture, and the 

 columella is thicker. 



Five out of six specimens before me have the apex of the spire 

 broken or naturally eroded, leaving but four of the whorls 

 remainintr. 



