Geological Society of London. 381 



but I is undoubtedly equivalent to the Wenlock, and K to the Ludlow. 

 In the Baltic provinces there are no representatives of the passage- 

 beds and Lower Devonian, but the Silurian strata are unconformably 

 covered by the Old Red Sandstone with Coccosteiis, Asterolepis, 

 Bothriolepis, Homosteiis, and Heterosteus, there being a marked over- 

 lap between the two series. The author argues in favour of con- 

 sidering the Cambrian, Ordovician, and Silurian as forming, in the 

 Baltic provinces, one " system." The author is able to construct a 

 section connecting the Silurians of Russia and Scandinavia, and pass- 

 ing through the islands of Gothland and Oesel. The paper is accom- 

 panied with a map and a tabulated list of fossils found at the several 

 horizons which have been distinguished by the author. He points 

 out which of these species are found ranging into other areas, and 

 proposes eventually to publish figures and descriptions of the 

 characteristic Russian forms. The first part of the author's paleeon- 

 tological work has just appeared in the shape of a memoir describing 

 60 species of Trilobites of the genera Phacops, Cheirurus, and Encri- 

 nurus. The total number of species of the Trilobites is about 150, 

 of which only about 15 occur in the Upper Silurian. 



6. "On Chilostomatous Bryozoa from Bairnsdale (Gippsland)." 

 By A. W. Waters, Esq., F.G.S. 



This paper continues the author's work on South Australian 

 Bryozoa, already communicated to the Society. It describes a col- 

 lection made by Mr. J. R. Y. Goldstein, containing 40 forms, of 

 w^hich 12 were not previously known to have existed in Australia. 

 Several species, however, known in other places as incrusting, here 

 occur in the Eschar a habit, and altogether the number of incrusting 

 species from this locality is small. The author calls attention to the 

 frequency with which the Australian Bryozoa exhibit different modes 

 of growth, showing the importance of preferring for classification 

 zooecial to zoarial characters. The three localities in Australia have 

 furnished 126 species of Chilostomata, of which 51 are known living 

 and 41 fossil ; 14 are considered identical with European Miocene 

 species, 17 with Pliocene, and 4 are thoiight to be identical with 

 Cretaceous species. The author gives a detailed description of the 

 various species in his Bairnsdale collection. 



7. " The Silurian Species of Glaiiconome, and a suggested Classifi- 

 cation of the Pala30zoic Polyzoa." By G. W. Shrubsole, Esq., F.G.S., 

 and G. R. Vine, Esq. 



The author discussed the history of our knowledge of the genus 

 Glauconome, and especially of the Silurian species. They then 

 characterized the genus, to which they refer only the Bala species 

 formerly regarded as identical with G. disticha, Goldf., but which 

 they describe as G. SedgioicJcii, Shrubs. Glauconome disticha, Goldf., 

 from the Wenlock of Dudley, is taken as the type of a new genus, 

 Ai'canopora. 



The authors then remarked upon the characters on which the 

 classification of the Polyzoa is founded, drawn from the study of the 

 recent forms, and stated that throughout the Cainozoic and Mesozoic 

 series no Polyzoa are known which cannot be referred to the recog- 



