GtoJu(jical Societi/. 195 



Pierinae witli 43 species, and iu this subfamih' we would call atten- 

 tion to the three plates devoted to the remarkable and most inter- 

 esting genus Dismorphki, exhibiting very strikingly the extraordinary 

 differences (mostly traceable to mimetism in various directions) 

 presented by no fewer than 16 species. Of the Satyrinte 33 species 

 are given, belonging chiefly to the genera Mtjcalests and Pedaliodes. 

 Some very fine Xymphalina^ are figured, notably several rare species 

 of Mynes, of Avhich M. Weh^teri from Xew Guinea presents an 

 underside of quite isolated character, while that of M. cottonis from 

 New Britain is curiously imitative of the underside shown by a 

 section of the Picrine genus Delias. The Morphinte are represented 

 by as many as nine species of the singular genus Teaaris, mostly 

 natives of Xew Guinea. 



We notice the announcement of a change as regards the issue of 

 future parts of this valuable work, viz. that, instead of the regular 

 quarterly publication of a part containing three plates, the parts will 

 be published at such intervals as may be found convenient, the 

 number of plates varying, and the price of each part being regulated 

 accordingly. We may add, however, that, notwithstanding this 

 announcement, there has been but little alteration either in the 

 dates of issue or in the number of plates in each part as yet pub- 

 lished in the third volume, which is being continued by Mr. Grose- 

 Smith without the cooperation of Mr. Kirby. B,. T. 



PROCEEDINGS OP LEARNED SOCIETIES. 

 GEOLOGICAL SOCIETY. 



April 20th, 1898.— W. Whitaker, B.A., P.R.S., 

 President, in the Chair. 



The following communication was read : — 



' Petalocrinus: By P. A. Bather, Esq., M.A., F.G.S. 



Certain curious fan-like objects, obviously echinodermal, have for 

 a long time been preserved in the Riks-Museum at Stockholm, but 

 their significance was first definitely ascertained when similar fossils 

 were foimd in Iowa, and brought to England by Mrs. Davidson. 

 The latter were described by Mr. Stuart "Weller in a paper entitled 

 ' Petalocrinus rnirahilis (n. sp.), and a New American Pauna; ' and 

 the former, with fresh material obtained by Mr. Weller from various 

 American localities, are the subject of the present communication. 



The Silurian crinoid genus Petalocrinus, Weller, is discussed, on 

 the evidence of all the original material from Iowa and of the 

 further material above mentioned. The replacement of the original 



