h'eniiD-ks oil Ihc Genus Art/irop/iycus, Hall. 83 



sandstone, though much finer grained than the enclosing 

 rock. The)' are from one inch in diameter to the size of a 

 small goose quill. I have traced some of them ten or twelve 

 feet in a serpentine course, without finding a natural termina- 

 tion, and sometimes without discovering much difference in the 

 diameter. Their texture sometimes appears a little fibrous, 

 and often presents the appearance of concentric layers. 

 Though their natural form is terete, they are often much com- 

 pressed. 



" They are not confined to the plane of ihe layers of the 

 enclosing rock, but often penetrate it obliquely. Several 

 branches originate from a thick stock in some specimens like 

 roots from the bottom of a stump." 



In 1831, Richard Harlan described and illustrated'^- the 

 same fossil under the name of Fiicoides alleghaniensis. The 

 specimens came from one of the ridges of the Alleghany 

 Mountains, in Pennsylvania. They were very numerous, and 

 varied in size from two to five inches long, the largest being 

 y'o- inches thick. In the following year the same authort 

 described, from a sandstone in the western part of New York, 

 a second species under the name of Fiicoides brongniartii. 

 This is evidently the same form as that first described, but it 

 should not be confounded with F. brongiiiartii, of Mantell, 

 described from England, in 1833.+ This is without doubt a 

 vegetable organism, the present generic designation of which 

 I am unable to give. 



In 1834, R. C. Taylorll reprinted Harlan's description of 

 Fiicoides alleghaniaisis, and discussed the graj'wacke group 

 of North America. He mentions the occurrence of the 

 species at various points in the Alleghany Mountains and 

 gives a figure of it. Several beds of rock contain the "plant;" 

 no casts of shells, " nor, indeed, any other organic body, 

 occur with these deposits." 



^Description of an extinct species of fossil vegetable, of the family Fiicoides- 

 Jotir. Acad. Nat Sci., Phila., vol. vi, 1831. pp. 289-295. 



tOn a new extinct fossil vegetable of the family Fiicoides. Monthlj' .'\ni. Jour. 

 Geol. & Nat. Sci., vol. i, Jan., 1S32, pp. 307-308. 



J The Geology of the Southeast of England. London, 1833, pp. 95-96. 



f A description of a fossil vegetable of the family F-ucoides, in the Transition 

 Rocks of North America, and some considerations of geology connected with it. 

 Loudon's Mag. Nat. Hist., vol. vii, 1S34. pp 27-32. 



