1 58 Proceedings of the Royal Society of Victoria. 



as certainly belongs to Euomphalus (or Oriostoma) Northi, for 

 there it is in situ, and a grain of fact is worth a pound of theory. 

 And now a word or two as to the bearing of this discovery on 

 the question as to the true genus to which the shell itself belongs. 

 Although, in deference to Mr. Etheridge, T have quoted it by the 

 generic name he has given it, viz., Oriostoma as an alternative 

 to our name Euoniphalus, Victorian geologists had always 

 recognised it as a Euomphalus, and it appears to me that the form 

 of the operculum it is now found to have possessed confirms our 

 view, for, as Mr. Etheridge himself admits, Oriostomas have conical 

 opercula, whereas this operculum is plano-concave and multispiral, 

 cr rather many times concentric, more like that of Euomphalus. 

 As a further point of resemblance to Euomphalus, it is well- 

 known that in Euomphalus the apex of the whorls is often filled 

 up by a secondary deposit of shell and the interior is often 

 divided off by transverse shelly partitions. Well, the same 

 feature is also to be seen in our genus when ground down, as 

 exhibited in the large specimen on the table; as however this is a 

 feature not confined to Euomphalus alone, but often found in 

 other shells of lengthened spire as well, it can only be regarded 

 as a slight confirmation. It would be presumption on my part 

 to differ fx'om so high an authority as that of Mr. Etheridge in a 

 matter of Palaeontology, were I not fortified by the result of an 

 appeal to another high authority, for I have shown this specimen 

 to Professor Sir E. McCoy, and he tells me it is not the first he 

 has seen from Lilydale with the operculum in situ, for Mr. 

 Pritchard showed him an imperfect specimen of the same kind 

 some years ago, and he authorizes me to state that he regards 

 the shell as certainly an " Euomphalus," and not an " Oriostoma" 

 at all, the latter being a name he restricts to a Tertiary genus. 



Niso (Vetotuba) Brazieri. 



There is a species of Gasteropod shell which Mr. R. Etheridge 

 has described in the records of the Australian Museum, Sydney, 

 vol. i., No. 3, as occurring in the Cave Hill Limestone at Lilydale, 

 and to which he has given the name of Niso (Yetotuba) Brazieri. 

 He says the material for giving a description of the shell is very 

 imperfect, but he has provisionally called it a Niso, on account 



