PRESTON: MOLLUSCA FROM THE MONTEBELLO ISLANDS. 



17 



the interior of the shell, a narrow band of scarlet and chestnut 

 running round the umbilical region ; umbilical area pearly, sunk into 

 a deep and narrow depression, a very thin polished callus extending 

 from it to the upper margin of the labrum ; columella-margin 

 nacreous, twisted into a coarse fold above, descending in a very 



oblique curve and terminating below in a blunt, nodulous pro- 

 tuberance; labrum acute, receding posteriorly, obliquely extended 

 anteriorly; aperture subrhomboidal; interior of shell nacreous, pale 

 bluish white, slightly iridescent. Alt. 56'5, diam. maj. 49, min. 

 45mm. Aperture: alt. 27, diam. 20mm. 

 Hub. — Montebello Islands, Western Australia. 



Stomatia scolpturata, n.sp. 

 Shell roundly auriform, narrowly perforate, rather thin, flesh- 

 coloured, painted with pale cinereous brown, broad, transverse flame- 

 markings, and tessellated below with the same colour; whorls Z\, 



bearing a single tuberculous revolving carina and one coarse, peri- 

 pheral, nearly smooth cai'ina and a number of fine, almost smooth, 

 spiral lirse, between all of which occur somewhat distant, spiral striae 

 and coarse, transverse lines of growth which develop into wrinkles 

 VOL. XI. — march, 1914. 2 



