BY C. HEDLEY. 489 



interior. Aperture very oblique, rhomboidal. Outer lip sharp, 

 bevelled within and carrying a strong deep-seated tubercle. 

 Parietal callus coarsely wrinkled. Columella spirally ascending 

 the umbilicus, terminating anteriorly in a massive bifid tooth, 

 and higher up supporting a small tubercle. Height 9 mm.; major 

 diameter 95 mm.; minor diameter 8 mm. 



A single perfect shell was gathered dead near high water mark 

 on the sand at the western extremity of the islet by the late 

 Mr. F. E. Grant. He regarded it with interest and was pleased 

 that it should bear his name. The grooved centre of the base 

 and smooth body whorl are recognition marks which distinguish 

 it from other Australian species* 



GiBBULA MACCULLOCHI, n.sp. 



(Plate XX., figs. 50, 51, 52.) 



Shell small, very solid, depressedly-globose, subcarinate. 

 Colour dull white, radially painted with flames of black 

 or chocolate, which persist more on ribs than interstices. 

 Whorls six. Sculpture : above the periphery six subgranose 

 spiral ribs, elevated, widely spaced, increasing in size from the 

 suture to the periphery and ascending the spire. Interstices 

 occupied by one or two spiral threads and roughened by fine 

 radial growth-lines. On the base, eight similar spiral cords 

 decreasing in size from the periphery to the umbilicus. Aperture 

 slightly bub suddenly descending, subquadrate. Inner edge 

 bevelled, of a dull callus, radiately plicate, the margins united by 

 a thick layer of callus, within brilliantly nacreous. An expansion 

 of the columella slightly intrudes upon the umbilicus, which is 

 narrow but deep, margined by a crenulate rib, internally with 

 two deep-seated funicles. Height 5*0 mm.; major diameter 

 6*5 mm.; minor diameter 5*5 mm. 



Common alive under loose coral blocks at low tide on Mast Head 

 Reef. I met it again, though less abundantly, in similar situations 

 on the Cairns Reef. 



The novelty has a general likeness to the New Caledonian 

 G. danieli Crosse, but is larger and difi'erently painted. It moie 



