146 PROCEEDINGS OP THE HALACOLOGICAL SOCIETY. 



I take these to be a broader, slightly larger, and more highly 

 coloured variety of the species described from the Navigator Islands ; 

 the operculum is thin, horny, and paucispiral. 



23. Omphalotropis Suteri, n.sp. PL XIII, Pig. 15. 



Testa anguste perforata, elongato-trochiformis, tenuiuscula, fere 

 lrevis, cornea aut brunneo-cornea, saepe lineis castaneis spiralibus et 

 lira unica circa umbilicum cincta, apice acutulo ; anl'ractus 6^, 

 applanati, sutura bene notata ; apertura piriformis, margine dextro 

 acuto, columellari subreflcxo, incrassatulo. Alt. 6, diam. max. 2-8 mm. 



Hal. — Norfolk Island (H. Suter) ; under dead wood and leaves 

 (coll. Brit. Mus.). 



A pretty little species, recalling Rissoia cingillus in shape and colour- 

 pattern. 



24. Diplomjiatina Coxi, H. Adams. 



Diplommatina Coxi, H. Adams: Proc. Zool. Soc, 1868, p. 446, 

 pi. xxxviii, fig. 11. 



Hah. — Norfolk Island (Adams) ; under dead leaves and wood (coll. 

 Brit. Mus.). 



25. Paludestrina Norfolkexsis, n.sp. PL XIII, Fig. 14. 



Testa anguste umbilicata, rotundato-ovata, fusco-brunnea, nitidula, 

 fere lsevis ; anfractus 3A-4, rapide creseentes, convexi, idtimus 

 magnus, inflatus, sutura valde impressa. ; apertura ovata, supra 

 angulum formans, peristomate intus incrassato, albido. Operculum 

 fusco-corneum, paucispirale. Alt. 2-5, diam. max. '_' mm. 



Hah. — Norfolk Island, in fresh-water streams (coll. Brit. Mus.). 



A very small, dark-brown species, with tumid whorls; the peristome 

 is generally thickened all round. 



26. Helicina pictella, Pfr. 

 Helicina pictetta, Tfeiffer: Proc, Zool. Soc, 1856, p. 392. 



Hal.—SorioW Island (Pfeiffcr, coll. Brit. Mus.). 



Helicina Norfolkemis, Pfr. (Proc Zool. Soc, 1856, p. 391), has 

 had doubt thrown on its specific distinction by Brazier, who expressed 

 the opinion that it was identical with H plicatilis, Mousson, and that 

 it did not really belong to the fauna of Norfolk Island. Mousson 

 (Journ de Conch., xxi, 1873, p. 114) stated that in his view the 

 species were distinct. I am unable to separate the specimens in 

 the British Museum from //. heryllina, Gould, and am of opinion that 

 the localization was erroneous. 



Specimens which appear to belong to Vallonia puluhella, labelled as 

 from ISorfolk Island, are in the British Museum. 



