130 PBOCEEBINGS OF THE MALACOLOGICAL SOCIETY. 



on the last whorl, though traces may be seen on the earlier whorls. 

 ]n shape it recalls A. simularis, Hartman, but is slightly more ovate 

 and shorter ; the difference in colour will at once separate them. The 

 plications on the apices of the two species are about equally marked. 



13. Amastka simulakis, Hartman, var. eoseotincta, n.var. 



Differs from the type in the colour being of a very much lighter 

 shade, the apex, however, being of the usual dusky tint; the shell 

 is also more ovate and shorter, and the lamina is slightly more 

 horizontal. I had proposed to describe this shell as a new species, 

 but a few specimens of the variable A. simularis show a slight 

 approximation, and it will, I think, only prove to be an extreme 

 variety. 



Hob. — Molokai Mountains (Perkins). 



14. Newcombia Peekinsi, n.sp. 



Testa siuistrorsa, anguste perforata, elongato-fasiformis, solida, 

 cineraceo-fusca, striis vel strigis f uscis fulgurantibus eleganter picta ; 

 spira gracilis, apice obtuso, laevi ; anf r. 6i, plauiusculi, ultimus ^ 

 altitudinis testte suba?quans ; sutura marginata ; columella subplicata ; 

 apertura parum obliqua, semiovalis, basi subangulata ; peristoma 

 simplex, margine columellari superne dilatato, adnato. Alt. 25, 

 diam. max. 7*5 mm. ; apert. alt. 7'5, lat. 4 mm. 



Sal. — Molokai Mountains (Perkins); Molokai (Baldwin, Hutchison). 



Specimens are to be found in some collections under the name 

 of N. Philippiana, PfeifFer. The present species, however, is larger, 

 much more solid, the whorls are flatter, the colouring is lighter and 

 different, the columellar lip is more reliexed, and the perforation 

 more conspicuous. 



One puzzling question of nomenclature requires consideration in 

 connection with the small, unicolorous, polished, almost imperforate 

 Zonitoid forms found in the Hawaiian Islands, and, indeed, scattered 

 over all Polynesia. 



They have been placed most usually in Microcystis, Beck, in which 

 course M. Ancey and Mr. Baldwin, in their respective papers on 

 the Hawaiian fauna, have concurred ; the latter further making 

 Microcystis a section of Nanina, Gray. To deal with the latter 

 point first, it may be pointed out that Risso ' had previously used 

 Nanina for a Mediterranean marine Gastropod, and that the name 

 therefore must be removed entirely from the nomenclature of land- 

 shells. The other point, namely, whether these shells belong to 

 Microcystis at all, requires far more consideration. 



1 Hist. Nat., vol. iv, p. 150, 1826. 



