Terrestrial Moll u sea from Norfolk Island. 535 



umbilicus moderately narrow, deep ; columella margin out- 

 wardly reflexed, descending in a curve, diffused above it into 

 a parietal callus which reaches to the upper margin of the 

 labrum ; labrum having the extreme edge submembranaceous ; 

 aperture ovate. 



Alt. 1, diam. maj. 225, diam. min. 2 mm. 



Hob. Mount Pitt, Norfolk Island {R. Bell). 



Paralaoma perminuta, sp. n. 



Shell minute, depressedly turbinate, thin, horny, pale 

 brownish yellow ; whorls 4, regularly increasing, sculptured 

 with somewhat obsolete, transverse, arcuate plicae; suture 

 impressed ; base of shell not very convex, sculptured with 

 slightly wavy and closely set, punctate, revolving striae ; 

 umbilicus moderately wide; columella margin obliquely 

 descending ; labrum simple ; aperture compressedly sub- 

 lunate. 



Alt. '25, diam. maj. l - 25 (nearly) mm. 



Hub. Mount Pitt, Norfolk Island {R. Bell). 



Paralaoma depressior, sp. n. 



Shell allied to P. perminuta, but considerably larger and 

 having an additional half whorl; the last whorl is con- 

 siderably flattened above and strongly angled at the peri- 

 phery, the colour is darker, being in the present species of a 

 dark brownish-amber shade ; the columella margin descends 

 almost vertically and the aperture, though somewhat com- 

 pressed towards the base, is obliquely subovate ; the system 

 of sculpture is altogether that of P. perminuta. 



Alt. "75, diam. maj. 2*25, diam. min. 2 (nearly) mm. 



Hob. Mount Pitt, Norfolk Island, in several localities 

 {R. Bell). 



NORFOLCIOCONCHA, gen. nov. {Endodontidoe) . 



Shell minute, subhyaline, turbinate, with open umbilicus, 

 sculptured with transverse riblets ; aperture armed with two 

 parietal lamellae and two lamellae on the outer wall. 



Genotype : Endvdonta norjolkensis, Hedley *. 



Norfolcioconcha iota, sp. n. 

 Shell very minute, depressedly turbinate, in subfossil 

 * Eec. Austr. Mus., Sydney, vol. iii. p. 152, pi. xxviii. figs. 4, 5, 6. 



