504 Transactions. 



As above noted, I introduced this genus-name for a smooth Kermadec 

 shell, and at the present time three Norfolk Island shells are associated 

 with it under my genus-name. Two of these are heavily sculptured, but 

 the third is smooth. I now doubt that these are congeneric with Fanulum, 

 as they all have a toothed and callused columella, though varying in shape 

 and sculpture. The report upon the anatomy of the species will settle 

 this point. 



Sykes proposed Fret am to cover a series of Norfolk Island shells, but 

 selected as type a Fijian species. This is not considered congeneric, so that 

 Belloconcha is made use of to indicate these Norfolk Island species, whose 

 generic affinity, however, would seem to be the Fijian Fret i on. 



Quintalia has been introduced as a genus-name for the species Sykes 

 classed under the New Zealand endemic genus Carthaea. I cannot see 

 any reason, from a study of shell characters, for the association of these 

 two. Carthaea, moreover, is placed in the Endodontidae, whereas I would 

 not so class Quintalia. 



Three extraordinary genera are represented in Mathewsoconcha, Ire- 

 daleoconcha, and Pittoconcha. Few specimens have yet been obtained, but 

 they all show quaint features. Mathewsoconcha recalls Belloconcha in form, 

 but it has a callused semi-toothed columella. Iredaleoconcha recalls Philip- 

 pine shells in general appearance, being somewhat flattened, keeled with 

 convex base, but it has a deeply channelled suture. A shell of verv similar 

 appearance has been lately obtained near Obi, in the Moluccas. Pitto- 

 concha is a small, somewhat conical, heavily sculptured shell, suggestive of 

 the style of sculpture seen in the Lord Howe species hoivinsulae. 



Macgillivrayella is a crystalline flattened Zonitoid of ordinary appear- 

 ance, yet quite unlike anything yet known. 



The preceding completes the Zonitoids as at present known living on 

 Norfolk Island, but Macgillivray collected three very minute forms which 

 Mr. Roy Bell did not obtain. One of these seems a typical Sitala as that 

 genus is represented in Fiji, whilst the other two are called Johannesoconcha. 

 and are quite remarkable minute forms, glossy and many-whorled ; nothing 

 has yet been collected from the north with which Johannesoconcha can be 

 compared. 



A shell of a Charopoid facies, but which plasters itself over with 

 mud, has been called Cryptocharopa. It is somewhat doubtful what its 

 affinities are, but some molluscs in New Caledonia indulge in the same 

 mud-plastering habits. 



The " Endodonts " are minute and very sparsely developed ; they 

 number six if Paralaoma be considered such, but three only otherwise. 

 One which has an armed aperture, and would be broadly classed in Pty- 

 chodon, has been generically termed Norfolcioconcha, as it does not fit well 

 in with either Ptychodon (typical), Thaumatodon, Nesophila, or any other 

 section. The other two are flat discoidal unarmed forms which are classed 

 in Charopa. It is somewhat remarkable that these three do not come 

 at all close to the Kermadec " Endodonts" ; but here again ignorance of 

 northern minutiae forbids investigation into their affinities. 



My genus Paralaoma. instituted for Kermadec species, is represented 

 by three forms, but as this genus is somewhat commonly distributed in 

 eastern Australia no great stress can be laid upon this fact. I suggest 

 that its discovery in northern groups may be confidently anticipated. It 

 seems a well-defined and easily recognizable genus, and I look forward to 

 the investigation of its anatomy with great interest. 



