286 Reports and Proceedings — Geological Society of London. 



sidered b}'' the author to be at a lower level than it is placed by M. 

 Lapparent, on account of the similarity to beds at Boulogne. The 

 true Portland rocks occur as ferruginous sandstones with Trigonia 

 gihbosa. 



e. Boulonnais. — The Houllefort limestone was correlated with the 

 Osmington Oolite. The Coral Rag of Brucdale was considered 

 equivalent to that of the Mont des Boucards, the so-called limestones 

 of the latter place being Supracoralline. The Neringean Oolite and 

 the Gres de Wirvigne represent the Astartian. ' The higher parts 

 of the series have been already correlated. 



From this study it was proposed — that the " Lower Calcareous 

 Grit," and almost all the Coralline Oolite should be placed in the 

 Oxfordian series as the upper division, under the name " Oxford 

 Grit," and " Oxford Oolite "; that the Corallian consists of two parts, 

 the Coral Eag and the Supracoralline beds ; that the Kimmeridgian 

 should include the Astartian and Virgulian, the Pterocerian being a 

 subzone; that the "Upper Kimmeridge " and the Hartwell clay, with 

 the " Portland sand," should make a new subdivision to be called 

 Bolonian, the northern and southern types being both represented 

 at Boulogne, which may be divided into Upper and Lower ; and 

 that the true Portland limestone and the Purbeck be united into one 

 group, as Lower and Upper Portlandian ; the fact of the latter being 

 freshwater being paralleled by parts of the true Portland having 

 that character. 



3. " On Fossil Chilostomatous Bryozoa from the Yarra-Yarra, 

 Victoria, Australia." By Arthur William Waters, Esq., F.G.S. 



The author gave a descriptive list of seventy-two pieces of Bryozoa 

 belonging to the suborder Chilostomata, from a lump of clay obtained 

 by Mr. Allen from the neighbourhood of the Yarra-Yarra Eiver. 

 The specimens are fragmentary, but in excellent preservation. 

 There are eight species of CateniceU'a, a genus unknown in the fossil 

 state until quite recently, when Mr. Bracebridge Wilson described 

 twelve fossil species, none of which are known living ; two of the 

 Yarra-Yarra species still live in the Australian seas, and one of 

 these also occurs in the Geological Society's collection from Mount 

 Gambler. Among the most interesting of all the specimens described 

 by the author is a Catenicella, consisting of long internodes, with a 

 double row of cells in each internode. The short-beaded Catenicellce 

 now living have probably been developed from forms with long 

 internodes. Microporella is also well represented by some interest- 

 ing forms, which make it necessary to widen the definition of the 

 genus. A very interesting Cellaria with subglobular internodes 

 explains the Cretaceous fossil called Eschara aspasia by d'Orbigny. 



Of the Chilostomata found in this deposit thirty-nine are con- 

 sidered new, although this number may have to be reduced ; nine- 

 teen are now found living; seven correspond with those from the 

 fossiliferous beds of Orakei Bay, New Zealand, described by Stoliczka; 

 about twenty-three are found in the Mount Gambler formation. Of 

 about thirty Cyclostomatous Bryozoa which occur in this deposit, at 

 least seven are common to it and Orakei Bay. Besides the Bryozoa, 



