Reports and Proceedinga — Geological Society of London. 283- 



ascending succession are characterized by the presence of Dibuno- 

 pJiyllum and CyatJiophyllum Mnrcliisoni, fossils which indicate, in 

 the Bristol area, the life-zone which immediately underlies the 

 Lonsdalia Beds. These two life - zones have been named by 

 Dr. Vaugban the Lower and Upper Dibunophyllum zones respec- 

 tively. The Cyathaxonia Beds and the cherts are equivalent to 

 a zone higher than the Upper Dibunophyllum zone of Bristol, 

 and not represented there. The black limestones (containing 

 Posidonomya Becheri) with shales, at Teilia, Holywell, and near 

 Bagillt, which occur above the cherts, are the homotaxial equivalents 

 of the Pendleside Series. These beds are followed by the Gwespyr 

 Sandstone, which is correlated with the Millstone Grit. A range- 

 table is given of the chief brachiopods and corals, and the palreonto- 

 logical sequence is compared with that occurring at Bristol and 

 in the North of England. A few notes on the palseontology 

 conclude the paper, and Dr. E. H. Traquair appends a short 

 description of a new species of ElonicJithys, occurring in the Holy- 

 well Shales. 



IL— April 25th, 1906.— J. E. Marr, Sc.D., F.E.S., Vice-President, 

 in the Chair, The following communications were read : — 



1. " Trilobites from Bolivia, collected by Dr. J. W. Evans in 

 1901-1902." By Philip Lake, M.A., F.G.S. 



Several horizons are represented by these fossils. Two specimens 

 of Peltura, probably from the Upper Zingula Flags, were collected at 

 Cochaiya, about 3 miles north-east of Pata. New species of Symphy- 

 surus and Trinucleus, probably of Arenig age, were found about 

 a mile from Apolo, Province of Caupolican. An indeterminable 

 species of Ogygia was obtained from the right bank of the Eiver 

 Caca, in the same province. Phacops cf. arhuteus, Dalmanites 

 Paituna, and D. Maecurua were collected in the track from Apolo to 

 San Jose de Chupiamonas, also in the province of Caupolican. The 

 nodules from which they were derived are probably of Lower 

 Devonian age. Descriptions are given of the new species and other 

 forms mentioned. It is worthy of remark that, while the earlier 

 forms show affinities with the contemporaneous European fauna, the 

 Devonian species are much more closely allied to those of South 

 Africa and North America. 



2. " Graptolites from Bolivia, collected by Dr. J. W. Evans in 

 1901-1902." Bv Ethel M. E. Wood, D.Sc. (Communicated by 

 Dr. J. W. Evans," LL.B., F.G.S.) 



In black pyritic shales from three localities several specimens 

 of Didymograptiis were collected ; one referable to hifidus, one of the 

 type of affiais, and one of the Nicliohoni type. Phyllograptus, 

 Glossograptus, Cryptograptiis, and DiplograpUis were also obtained. 

 A pale, silky grey shale shows also rare graptolites, belonging to 



