io SCIENCE PROGRESS. 



in the Cambrian system is to be deprecated, and the writer 

 would suggest that any fossiliferous margins which are in 

 future proved to be of an age antecedent to that of the 

 Olenellus beds should be placed in a system earlier than the 

 Cambrian. 



A paper of interest to British geologists ( io) adds to our 

 knowledge of the rid^e which existed in Central England 

 in early Carboniferous times. Prof. Hull records the results 

 of a boring which passed through 262 feet of Bunter Sand- 

 stone and 514 feet of Coal Measures, and reached a reddish- 

 purple and grey grit and micaceous quartzite which was 

 pierced to a depth of 19 feet from its summit. He considers 

 that this probably belongs to the Lower Cambrian, a view 

 with which Prof. Lapworth concurs, in which case the Lower 

 Coal Measures and all the Carboniferous rocks beneath them, 

 as well as the Devonian, Silurian, Ordovician and higher 

 Cambrian rocks, are absent. 



A valuable historical sketch, treating exclusively of the 

 Cambrian rocks, appeared in the latter half of 1894 i 11 )- 

 In this paper Dr. Hicks gives an account of the progress 

 of work during thirty years as concerned with the discovery 

 of the various life-zones of the Cambrian rocks. Though 

 the paper is a historical sketch, and not a record of new 

 observations, it is of importance to the student not merely 

 as an epitome of our present knowledge of the Cambrian 

 strata, but also as an indication of how that knowledge was 

 obtained, and is therefore particularly suggestive of lines 

 along which research may be carried in the immediate 

 future. 



Several contributions to the palaeontology of the Ordo- 

 vician and Silurian rocks have been made in the period 

 under notice. Pocta (12) gives another instalment of the 

 great work commenced and carried out for so many years 

 by Barrande ; he describes the Bryozoa of the Lower 

 Palaeozoic area of Bohemia. F. Schmidt (13) makes 

 another contribution to his accurate descriptions of the 

 trilobites of Esthonia and Livonia. In this memoir he 

 treats of the genera Calymene, Bronteus, Proetus, Cyphas- 

 p?s, MciiocepJiahis, Harpides, Harpcs, Trimicleus, \Ampyx, 



