456 FLORA OP THE CARBONIFEROUS PERIOD. 



thew and C. F. Hartt, Esqs., St. John, New Brunswick, I am in- 

 debted to the kindness of those gentlemen. To Mr. Brown especially 

 I am under great obligations for his liberality in placing at my dis- 

 posal his large and valuable collection of the plants of the Cape 

 Breton coal field. 



The general conclusions deducible from the above catalogue, 

 as well as detailed descriptions of the new species, I hope to give 

 more fully hereafter, when I shall have completed ray examination 

 of the microscopic structure of the several coal seams. In the mean 

 time the following summary may be useful : 



1. Of 192 nominal species in the list, probably 44 may be 

 rejected as founded merely on parts of plants, leaving about 148 

 true species. 



2 Of these, on comparison with the lists of Unger, Morris, and 

 Lesquereux, 92 seem to be common to Nova Scotia and to 

 Europe, and 59 to Nova Scotia and the United States. Most of 

 these last are common to Europe and the United States. There 

 are 50 species peculiar, in so far as known, to Nova Scotia, though 

 there can be little doubt that several of these will be found else- 

 where. It would thus appear that the coal flora of Nova Scotia is 

 more closely related to that of Europe than to that of the United 

 States, a curious circumstance in connection with the similar re- 

 lationship of the marine fauna of the period ; but additional in- 

 formation may modify this view. 



2. The greater part of the species have their head-quarters in 

 the Middle coal formation, and scarcely any species appear in the 

 Upper coal formation that are not also found in the former. The 

 Lower coal formation on the other hand seems to have a few pe- 

 culiar species not found at higher levels. 



3. The characteristic species of the Lower coal formation are 

 Lepidodendron corrugatum and Gyclopteris Acadica, both of which 

 seem to be widely distributed at or near this horizon in Eastern 

 America, while neither has yet been recognized in the true or Mid- 

 dle coal measures. In the Upper coal formation Calamites Sucks 

 owii, Annidaria galioides, Sphenophyllum emarginatum,Cordaite- 

 simplex, Alethopteris nervosa, muricata etc., Pecopteris arbores- 

 < ens, P. abbreviata, P. rigida, Neuropteris cor data, Dadoxylon ma- 

 teriarum, Lepidophloios parvus, Sigillaria scutellata, are char- 

 acteristic plants, though not confined to this group. 



4. In the Middle coal formation and in the central part of it, 

 near the greater coal seams,occur the large majority of the species 



