CONTENTS, 



PAGE. 



I. — Preface, by Sir "W. E. Logan, P.R.S., Director of the Geological 



Survey of Canada 5 



II On the Cystide^ of the Lower Silurian Rocks of Canada. By 



E. Billings, Esq., F.G.S ; .> L-.i.'.'. 9 



III. — On the AsTERiAD.® of the Lower Silurian Rocks of Canada. By 



E. Billings, Esq. ... A 75 



IV. — On Cycloctstoides, a new genus of Echinodermata from the Lower 

 and Middle Silurian Rocks. By J. W. Salter, Esq., F.G.S., of 

 the Geological Survey of Great Britain, and E. Billings, Esq.. 86 



V. — On the Palaeozoic Bivalve Entomostraoa of Canada. By T. R. 



Jones, Esq., F.G.S. . ?.i^.:Kl 91 



