Terrestrial Mollusca from Norfolk Island. 529 



transverse plicae, and rather indistinct spiral striae ; suture 

 impressed ; base of shell somewhat convex ; columella margin 

 callously thickened, forming with the parietal wall a small 

 notch above, below which it descends obliquely to form an 

 obtuse angle with the labium below ; labium simple. 



Alt. 5\5, diam. maj. 8*75, diam. min. 7*5 mm. 



Aperture: alt. 4, diam. 4 5 mm. 



Hub. Norfolk Island, subfossil in sand near the limestone 

 quarry on the S.E. coast (R. Bell). 



Mi ■! (heiosoconcha vex ilium, sp. n. 



Shell conoidly turbinate, in subfossil condition white, 

 strikingly painted with a rather narrow, reddish-orange, 

 suprasutural band, which appears as a peripheral band on the 

 last whorl ; whorls 5, regularly increasing, the first two a 

 little flattened above, the remainder moderately convex, 

 bearing traces of very fine spiral striae, and marked with 

 numerous fine oblique growth-ridges ; suture impressed ; 

 columella margin descending obliquely, developed throughout 

 almost its whole length into a medianly excavated projection, 

 and diffused above into a thin, well-defined, parietal callus 

 which reaches to the upper margin of the labium ; labrum 

 acute, receding below ; aperture broadly and compressedly 

 obliquely sublimate. 



Alt. &25, diam. maj. 9, diam. min. 8 mm. 



Aperture : alt. 4'5 (nearly), diam. )5'5 mm. 



Hob. Limestone Quarry, Norfolk Island, in subfossil 

 condition only (/£. Bell). 



Belloconcha, gen. no v. {Zonitidaz). 



Shell imperforate, heliciform, turbinately conic, marked 

 only with transverse growth-plicae. 

 Genotype: B. elevata, Preston. 



Belloconcha elevata, sp. n. 



Shell imperforate, conically turbinate, in subfossil con- 

 dition white without trace of colouring ; whorls 5, regularly 

 increasing, convex, smooth, but for rather oblique growth- 

 ridges; suture impressed, narrowly margined below; colu- 

 mella margin outwardly calloused, descending in a curve ; 

 labium acute; aperture very obliquely broadly sublunate. 



Alt. 11, diam. maj. 1 4*75, diam. min. 12'75 mm. 



Aperture : alt. 6'25, diam. 6*75 mm. 



JJab. Nepean Island, in subfossil state only (22. Bell). 



