SUPPLEMENT. 497 



CANADIAN GRAPTOLITES. 



Report op James Hall, Esq., addressed to Sir William E. Logan, F.R.S,, 

 Director op the Geological Survet op Canada. 



Albany, Mabch 1, 1858. 



SiK — In reply to your inquiry regarding the Graptolites and other allied 

 genera, confided to me for description on behalf of the Geological Survey 

 of Canada, partly in 1854 and partly at a subsequent time, I have the 

 honor to inform you that six plates of the Graptolites have been engraved, 

 and are now only waiting to be lettered, and that drawings for ten plates 

 more are in the engraver's hands. 



The description of twenty-four species accompanies the present com- 

 munication, and the plates will follow as fast as they are completed. 



In April 1855, I communicated to you a note upon these remarkable 

 graptolites, discovered in the progress of the Geological Survey of Canada 

 during the previous year. This discovery gave for the first time a know- 

 ledge of the true forms and mode of growth of these fossils, of which 

 fragments and detached branches have for so many years been described 

 as complete forms. Neither up to that time, nor, so far as I am aware, to 

 the present, has any evidence of the existence of perfect forms such as 

 these been given to the public. 



Two of the species were described in the note transmitted to you in 

 1855, and I have preceded the description of the remainder by a repeti- 

 tion of that note. 



I have the honor to be, Sir, your most obedient servant, 



JAMES HALL. 



[ PALaoNTOLoar III.] 63 



