294 THE CANADIAN NATURALIST, [Vol. vi. 



of the whole of his Cambrian with the Lower Silurian of Mur- 

 chison. The reader will sympathize with the indignation with 

 which Sedgwick declares that his map was " most unwarrantably 

 tampered with," and will, moreover, learn with surprise, that 

 an inspection of the proof-sheets of Warburton's abstract of 

 Sedgwick's paper was refused him, notwithstanding his repeated 

 solicitations. The story of all this, and finally of the refusal to 

 print in the pages of the Geological Journal the reclamations of 

 the venerable and aggrieved author, make altogether a painful 

 chapter, which will be found in the Philos. Magazine, for 1854 

 [IV, viii, pp. 301-317, 359-370, and 483-506] and more fully 

 in the Synopsis of British Paleozoic Eocks, which forms the 

 introduction to McCoy's British Paleozoic Fossils. 



In connection with this history it may be mentioned that in 

 March, 1845, Sedgwick presented to the Geological Society a 

 paper on the Comparative Classification of the Fossiliferous 

 Bocks of North Wales and those of Cumberland, Westmoreland, 

 and Lancashire ; which appears also in abstract in the same 

 volume of the Geolou;ical Journal that contains the abstract of the 

 essay and the map just referred to. [I, 442.] That this ab- 

 stract also is made by another than the author is evident from 

 such an expression as " the author's opinion seems to be grounded 

 on the following facts, etc.,'' (p. 448) and from the manner in 

 which the te.ms Lower and Upper Silurian are applied to certain 

 fossiliferous rocks in Cumberland. Yet the words of this ab- 

 stract are quoted with emphasis in Siluria [1st ed., 147] as if 

 they were Sedgwick's own language recognizing Murchison's 

 Silurian nomenclature. 



II. — Middle and Lower Cambrian. 



Investigations in continental Europe were, meanwhile, prepar- 

 ing the way for anew chapter in the history of the lower paleozoic 

 rocks. A series of sedimentary beds in Sweden and Norway had 

 long been known to abound in singular petrifications, some of 

 which had been examined by Linnaeus, who gave to them the 

 name of EntomoUthi. They were also studied and described by 

 Wahlenberg and by Brongniart, the latter of whom, from two 

 varieties of the Eutomolithus paradoxus^ Linn, established in 

 1822 two genera, Paradoxldts and Agnostus. In 1826 ap- 

 peared a memoir by Dalmao on the PalseadEe or so-called Trilo- 



