smith: notes ox some species of land shells. 109 



2. Nanina divisa, Forbes.* 



With this species Mr. Hedley has united as varieties, two species, 

 which, in my opinion, may with advantage, be kept distinct, viz., 

 JV. inclinata, Pfr., and JV. rosseliana, Smith. They all occur in the 

 Louisiade Islands, south-east of New Guinea ; JV. divisa on Sudest 

 Island ; JV. inclinata on St. Aignan ; and N. rosseliana on Rossel 

 Island. N. inclinata is a little larger than JV. divisa, more acutely 

 keeled, a trifle more narrowly perforate, and the aperture is longer 

 from the umbilicus to the angulation of the outer lip. JV. rosseliana 

 is much larger than either of the above forms, is of a rich vinous 

 brown tint, and is altogether different at a general glance. That the 

 three forms possess a close relationship, and that they were derived 

 from one original stock is perfectly evident, but having become 

 isolated the differences which I have pointed out will probably be 

 maintained, and in course of time possibly accentuated, and 

 therefore I maintain that the "lumping" of these forms is not 

 advisable. It is difficult to be consistent in one's views respecting 

 the value of so-called species, especially when one's own species are 

 in question. In this instance, however, putting aside all personal 

 feeling, I think it would be better to retain the three forms, which 

 occur on different islands, as distinct species rather than as varieties 

 of one and the same species. 



3. Nanina infelix, s/>. nov. 



Testa depressa, cat inata, superne leviter conica, angustissime 

 perforata, subtenuis, dilutissinie fuscescens, subtus pallidw ef 

 nitida : anfractus 6, regulariter crescentes, Una's incrementi 

 obliquis arcuatis, sculpti, convcxiuscuti, sed supra suturuin 

 imprcssi vel concavi, ultimus ad peripheriam acute carinafus, 

 utrinque carinam impressus, antice hand desce/idens, inferne 

 politus, radiatim tenuiter striatus ; apertura mediocris, ad 

 carinam angulata ; peristoma simplex, margine supero ten///', 

 inferiori arcuato, umb/lic/in/ versus leviter ii/crassato et rejicxo. 



Diam. n/aj. 24 mill/'///., ///in. 21, alt. 12. Apertura 12 lata, 

 7i alt a. 

 This species from the mainland is about the same size as JV. divisa 

 from Sudest Island. It is more narrowly perforated, has a higher 

 and more conical spire, and has no spiral striae like that species. 



Mr. Hedley has mentioned a variety of JV. divisa (var. minor) 

 also from the mainland, "resembling the type in outline but smaller 

 and lighter in colour." This may be the same as the form described 

 above, the more conical spire and the absence of spiral sculpture 

 having been overlooked. 



Hedley, loc. cit., p. 73. 



