Terrestrial Mollusca from Norfolk Island. 525 



AUenoconcha, voyana, sp. n. 



Shell small, very depressedly turbinate, in colour greenish 

 brown; whorls 5, regularly increasing, the last angled at 

 the periphery, sculptured with very fine, microscopic, closely 

 set, wavy, spiral stria?, and marked with radiate growth-plica? ; 

 suture impressed ; columella margin very obliquely de- 

 scending; labium simple, outwardly extending above, re- 

 ceding below; aperture obliquely sublunate. 



Alt. 2, diam. maj. 4*75, diam. min. 4 mm. 



Hab. Duncombe Bay, Norfolk Island (R. Bell). 



AUenoconcha congener, sp. n. 



Shell differing from M. royana in its darker colour, which 

 is of a deep reddish-brown shade, less depressed form, and 

 less oblique columella margin. 



Alt. 3*25 (nearly), diam. maj. 4*75, diam. min. 4*25 mm. 



Hab. Duncombe Bay, Norfolk Island (R. Bell). 



GREENWOODOCONCHA, gen. nov. (Zonitidce). 



Shell turbinate, with somewhat convex base, imperforate, 

 moderately solid, finely spirally striate. 

 Genotype : Microcystis nux } Sykes*. 



Greeniooodoconcha tomi, sp. n. 



Shell turbinate, with convex base, reddish brown, polished, 

 shining ; whorls 4^, regularly increasing, the last considerably 

 angled at the periphery, sculptured with slightly curved, 

 transverse plica? and rather closely set, wavy, spiral stria?, 

 which become finer on the last whorl ; suture impressed, 

 margined below, the margin being also spirally striate; 

 columella margin reflexed, almost perpendicularly descending 

 above, obliquely curved below, diffused above into a well- 

 defined, whitish, parietal callus which reaches to the upper 

 margin of the labrum ; labrum simple; aperture rather 

 obliquely broadly sublunate. 



Alt. 3, diam. maj. 5'25, diam. min. 4*75 mm. 



Aperture : alt. 2, diam. '2,'b mm. 



Hab. Mount Pitt, Norfolk Island (/?. Bell). 



* Proc. Make. Soc. Loudon, vol. iv. 1900, p. 139, pi. xiii. tigs. 4 &. o. 



