BY C. HEDLEY. 15 



gibbous and descending, constricted behind the aperture. 

 Sculpture : above finely spirally grooved, hollowed at the peri- 

 phery between two keels, on the base with radial riblets latticed 

 by spiral threads. Aperture subquadrate, very oblique, peristome 

 everted, slightly thickened. Height 7, major diam. 1-14, minor 

 diam. 0-96 mm. 



Hab. — Betw^een Cape York and New Guinea, in 8 fathoms, 

 sandy mud bottom; one specimen (J. Brazier). 



Type. — To be presented to the Australian Museum. 



Mecoliotia spinosa, n.sp. 



(Plate ii., fig. 26.) 



Shell minute, solid, broader than high, spire elevated, base 

 flattened. Colour white (? bleached). Whorls four and one-half 

 in the decollate example studied. Sculpture : a strong projecting 

 spiral keel runs down the last three whorls, beneath which on 

 the body whorl is a deep narrow groove and sharp cord, succeeded 

 by a smaller groove and cord. Radiating ribs, of which the last 

 whorl has fourteen, commence at the suture, develop sharp points 

 on the spiral keel, partition the peripheral groove into a series of 

 deep narrow pits, bead the peripheral rib and disajDpear. A 

 minor sculpture of faint spiral threads is visible above and 

 beneath the periphery. Umbilicus w^de but rapidly narrowing 

 above. Aperture very oblique, circular, double, with a broadly 

 expanded varix. Height 84, major diam. 1, minor diam. 

 0-82 mm. 



Hah. — Off PijDon Islands, N. Queensland ; 9 fathoms, mud 

 bottom; one specimen (J. Brazier). 



Type. — To be presented to the Australian Museum. 



This species is smaller, with a wider umbilicus and more prickl}^ 

 sculpture, than M. haUigani.'^' 



* Hedley, Atoll of Funafuti, 1S90, p. 555. 



