434 Geological Society. 



The horizon from which this new species was obtained is that of 

 the Llanvirn Beds, some typical Llanvirn fossils having been found 

 with it. The author named the species Conoceras llanvirnensis. 



5. " Eossil Cyclostomatous Bryozoa from Australia." By A. W. 

 Waters, Esq., F.G.S. 



In the present paper the Cyclostomata from Curdles Creek, Mount 

 Gambler, Bairnsdale, Muddy Creek, &c., Aldiuga and River-Murray 

 Cliffs were described, bringing the total number of fossil Bryozoa from 

 Australia, dealt with in this series of papers, up to 195, of which 85 

 are known living. Of the 32 Cyclostomata now dealt with, 12 

 at least are known living, and one cannot be distinguished from a 

 Palaeozoic form ; 9 are apparently identical with European Creta- 

 ceous fossils. 



Although so many remind us of European Chalk and Miocene 

 species, great stress was laid upon the imperfect data available for 

 such comparisons, the Cyclostomata furnishing but few characters 

 which are available for classification, which, so far, has almost 

 entirely been based upon the mode of growth, which, in the Chilo- 

 stomata, has been shown to be of secondary value. In consequence 

 of the few available characters the Cyclostomata do not seem likely 

 to be ever so useful palaeontologically as the Chilostomata, and as 

 they are less highly differentiated, it is not surprising to find that 

 they are more persistent through various periods. 



In order to see how far other characters might be available, the 

 author has examined Cyclostomata, both recent and fossil, from 

 many localities and strata, and pointed out that the size of the 

 zooecia should always be noticed, as also the position of the closure 

 of this tube. The arrangement of the interzooecial pores may fre- 

 quently give great assistance, and these are considered the equiva- 

 lents of the ro8ette-j)lates ; but the most useful character of all is 

 no doubt the ovicell, which varies specifically in position and struc- 

 ture ; but this unfortunately occurs on but few specimens, and has 

 rarely been described fossil, altliough greater attention to this will 

 no doubt lead to its being frequently found and noticed. 



6. " A Critical and Descriptive List of the Oolitic Madreporaria 

 of the Boulonnais." By R. F. Tomes, Esq., F.G.S. 



The author commenced with some general remarks upon certain 

 Oolitic genera of Corals, especially Bathi/aenia, Cyathophora, and 

 DepaphylJum. He stated that his observations upon the Corals of 

 the Great Oolite of the Boulonnais confirm the conclusions as to the 

 palfeontological uniformity of that formation based by Dr. Lycett 

 chiefly on the study of the MoUusca. In the Boulogne district the 

 Great Oolite rests immediately upon Palaeozoic rocks, and there are 

 no traces of any Corals of Inferior-Oolite type. Those met with 

 near the bottom of the Great Oolite seem to approach those of the 

 Eno-lish Cornbrash. After a tabular sketch of the different beds of 

 Oolitic age in the Boulonnais, the author gave a list of the species 

 as follows : — 



From the Great Oolite : — Discocoeaia honoidensis, g. & sp. n. ; 



