1873.] AUSTRALIA AND THE SOLOMON ISLANDS. 147 



apex ; spire elongated ; whorls 7, very gradually increasing in size, 

 the last one being subcarinated ; base rounded ; aperture lunar-oval ; 

 periphery straight ; margins slightly approximating, and united by a 

 rather thin columellar callus, which descends perpendicularly, and 

 becomes broadly dilated, concealing the umbilicus ; aperture and 

 interior of the lip pale, the lip shortly reflected throughout. 



Diam., greatest 080, least 0*68; height 1'22 inch. 



Hab. Solomon Islands. 



In the collection of Mr. W. H. Hargraves, of Sydney. 



Helix (Discus) cerealis, sp. nov. (Plate XVI. fig. 1.) 



Shell with a deep, rather narrow umbilicus, subpellucid, of a dull 

 white colour, rather coarsely obscurely striated above, smoother and 

 shining at the base ; spire slightly raised, bluntly rounded ; whorls 

 6, slowly increasing in size, the last one subcarinated, shortly 

 depressed in front and flatly expanded outwardly, broader at the 

 base ; aperture very oblique, transversely oblong ; lip slightly thick- 

 ened and everted above, reflexed below ; margins approximating, 

 united by a thin glazed callus ; columellar margin triangularly 

 dilated at its insertion, and overhanging the umbilicus. 



Diam., greatest 0*72, least 0"62 ; height 0*50 of an inch. 



Hab. Solomon Islands. 



In the collection of Mr. W. H . Hargraves, of Sydney. 



Helix (Geotrochus) quirosi, sp. nov. 



Shell imperforate, conoidly depressed, thin, translucent, rather 

 coarsely striated, of a pale brown throughout ; spire broadly and 

 flatly conoid, acute at the apex ; whorls 5^ to 6, convexly flattened, 

 the last one considerably inflated, and sharply keeled at the peri- 

 phery ; base rounded ; aperture squarely lunar, angled at the peri- 

 phery of the last whorl and at the junction of the lower and 

 columellar margins ; lip slightly thickened and expanded ; colu- 

 mellar margin straight, thickened, not dilated nor reflexed. 



Diam., greatest 080, least - 64 ; height 0'40 of an inch. 



Hab. Solomon Islands. 



In the collection of Mr. W. H. Hargraves, of Sydney. 



This species would be like a magnified specimen of H. cleryi 

 (Recluz) were it not wholly unornamented, much more broadly 

 expanded, and less conical. 



Helix (Geotrochus) blanda, sp. nov. 



Shell imperforate, conical, very thin, translucent, obliquely 

 finely striated, of a pale brownish yellow ; spire with the apex 

 acute ; whorls 7, gradually increasing in size, the last moderately 

 inflated and sharply carinated at the periphery ; base flattened ; 

 suture not margined ; aperture subrhomboidal, margins somewhat 

 approximating, not united by a callus, subangulate at the periphery 

 of the last whorl ; margins simple, slightly everted, columellar 

 margin descending vertically, joining the basal margin at an obtuse 

 angle. 



10* 



