502 STUDIES ON AUSTRALIAN MOLLUSCA, 



ascertained the date of publication of Smith's name to be August 

 1st, 1884. Therefore precedence must be given to Nerita melano- 

 tragns, Smith. 



In the last Volume of these Proceedings (p. 239) Mr. W. R. 

 Harper drew attention to the use made of this shell by an extinct 

 tribe of aboriginals. 



LlOTIA ROSTRATA, ll.Sp. 



(Plate xxvi., figs. 4, 5, 6, 7.) 



Shell small, rostrate, subdiscoidal, spire sunk, base widely 

 excavate, thin and translucent. "Whorls three and a half, 

 separated by a deeply channelled suture, rapidly increasing, last 

 keeled. Parallel to the suture, along the periphery and around 

 the umbilicus run three solid opaque ridges; from the sutural 

 band to the periphery and from that again to the umbilical 

 border, 1'adiate a dozen connecting bars. This sculpture may be 

 otherwise expressed as a dozen tongue-shaped spaces excavated 

 out of the substance of the shell above and below the periphery; 

 the hollows translucent, the elevations opaque Crossing ridges 

 and furrows alike are minute, close lines, which on higher magni- 

 fication (fig. 7) resolve themselves into strings of -oval pearls. 

 Base wide and deeply excavate. Aperture oblique externally 

 thickened all round. At the junction of the periphery, the lip is 

 produced into a heavy projecting knob which furnishes an 

 excellent recognition mark to the species. Major diameter 2*72, 

 minor diameter 1-92, height 1*2 mm. 



Hob. — Thursday Island, Queensland; several examples collected 

 by Mr. J. Brazier. 



Type to be presented to the Australian Museum. 



LlOTIA PHILTATA, n.Sp. 



(Plate xxvi., figs. 1, 2, 3.) 



Shell depressedly turbinate, rather narrowly and deeply umbili- 

 cate, spire plane, last and penultimate whorls turreted. Colour 



