NOTICE 



The ' Monograph on the British Trilobites,' as originally proposed by the 

 late Mr. J. W, Salter, was intended to comprise descriptions of the Group 

 from the first appearance of the forms in the Cambrian strata to their final 

 cessation in the beds of the Carboniferous series. Unfortunately death stayed the 

 ready pen of the author in 1869 ; and the work, begun in 1864, was not resumed 

 after 1867. Very many British Trilobites remain to be described. The author 

 at the time of his decease had not reached the Carboniferous genera, and, indeed, 

 had not had the opportunity of illustrating more than about one half of the total 

 number of the Cambrian, Silurian, and Devonian species. 



T. W. 



6th September, 1883. 



