110 



TRANSACTIONS OF THE 



NATURAL ORDER ALGiE. 



FAMILY FUCOIDES. Sternb. 

 F. dentatus, Ad. Brongniart. 



Hist, des veg. foss. vol. i. p. lxxx. pi. vi. fig. 9. 12. 



Locality. Point Levi near Quebec, Canada. 



Place in the Geological series. Transition limestone. 



F. serra. Ad. Brongniart, Hist. des. veg. foss. 

 p. lxxxi. pi. vi. fig. 7. 8. 



Locality. Point Levi near Quebec. 



Place in the Geological series. Transition limestone. 



F. Brongniartii. Harlan, Monthly journal of geolo- 

 gy &c. 1831. First figured in the present volume, vid. 

 pi. iii. fig. 6. 



Locality. Welland canal, Canada ; western part of 

 the state of New York ; mountain ranges of Western 

 Pennsylvania and Virginia. 



Place in the Geological series. Siliceous sandstone — 

 Grau wache slate, and old red sandstone. 



For further observations on this ; and analogous fos- 

 sils, vid. Mr. Taylor's memoir above referred to. 



In Hitchcock's Geology, pp. 233, 234. pi. xiii. 

 fig. 38, 39 — there occurs a description of a fossil ve- 

 getable, which on very doubtful authority, Professor 

 H. refers to a fossil fucus, analogous to that above des- 

 cribed. In the opinion of this " authority " the fossil in 

 question "evidently belongs to the fossil genus fu- 

 coides, of which Dr. Harlan has described a species 

 from the sandstone of Genesee, under the name of F. 

 Brongniartii. If the specimens were weathered, their 



