.Notices of Memoirs — The British Association. 557 



J. S. Gardner. — On the Eelative Ages of the American and English. 

 Cretaceous and Eocene Series. (Printed in extenso, p. 492.) 



E. Wethered. — On the Structure of English and American Carbon- 

 iferous Coals. (See p. 515.) 



Prof. T. R. Jones, F.R.S. — Second Eeport on the Fossil Phyllopoda 

 of the Paleeozoic Eocks. (See page 348.) 



A. H. Maclcay, D.A., A.Sc. — A Preliminary Examination of the 

 Siliceous Organic Eemains in the Lacustrine Deposits of the 

 Province of Nova Scotia. (See p. 561.) 



C. E. De Bnnce. — Tenth Eeport of the Committee upon the Under- 

 ground Waters in the Permeable Formations of England and 

 Wales, and the Quantity and Character of the Water supplied 

 to various Towns and Districts from those Formations. (See 

 p. 475.) 



G. B. Vine. — Fifth Eeport on Fossil Polyzoa. 



J. W. Davis. — Eeport upon the Exploration, of Eaygill Fissure in 

 Lothersdale, Yorkshire. 



(September 3, 1884.) 



G. F. Mattheios, A.M., F.R.S. C— The Geological Age of Acadian 



Fauna. (See p. 470.) 

 G. F. Matthews, A.M., F.B.S.C.— The Primitive Conocoryphean. 



(See p. 471.) 

 C. E. Be Bance and W. Topley. — Eeport of the Committee upon the 



Eate of Erosion of the Sea Coasts of England and Wales, and 



the Influence of the Artificial Abstraction of Shingle and other 



Material in that Action. (See p. 566.) 

 Frof J. Milne. — Fourth Eeport on the Earthquake Phenomena of 



Japan. 

 Prof. E. Hull, LL.D., F.B.S.~The Geology of Palestine. 

 P. Hallett, l/.yl.— Notes on Niagara Falls. (See p. 563.) 

 A Paper of Geological importance was read, on Sept. 1st, in 



Section B — Chemical Science — by Sir IE. E. Boscoe, on the 



Diamondiferous Deposits of South Africa and the Ash of the 



Diamond. 



Abstract of Papers Eead in Section C, Geology. 



1. — On the Fossil Eeticulate Sponges constituting the 



Family Dictyospongid^. 



By Professor James Hall, LL.D. 



OUE knowledge of these forms in America dates back to 1842, 

 when Mr. Conrad described a peculiar fossil body under the 

 name Uyndoceras (in the belief of its relation to Ortlioceras). Sub- 

 sequently in the same year another form by Vanuxem as a marine 

 plant, and in 1862 Dawson as Algae, and followed by Hall in 1863, 

 who described several of the species under the name Dictjjophi/ton ; 

 adopting Vanuxem's name TJphantcBnia for other forms. 



In 1879 Mr. C. D, Walcott described a form referable to this group 

 of fossils, from the Utica State, as Cyathophycus. In 1881 Mr. E. 



