282 



PALEONTOLOGY OF NEW-YORK. 



315. 2. SPHENOTHALLUS LATIFOLIUS (w. 5;j.). 



Pl. LXVIII. Figs. 2 a -f. 



Leaves broadly cuneate, somewhat (hickened at the outer margin, and truncate at the 

 lower extremity ; surface obscurely striated. The specimens are often marked on one side 

 by a ridge or midrib along the centre, and sometimes transversely wrinkled. These leaves 

 all appear to have been thick and succulent, like the Fuci. 



A large number of specimens have been seen, but in no case has one been discovered 

 where the leaves are attached to the stem. Fragments of similar substance are often found 

 with these leaves, which may have been parts of the stems of this species. The specimens 

 present a dark carbonaceous surface, contrasting with the greenish shale in which they 

 are imbedded. 



Fig. 2 a. A leaf nearly entire, showing a depressed line along the centre. 



Fig. 2 J. A similar leaf, with a sharp ridge along the centre. 



Fig. 2 c. A leaf of a narrower and more elongated form, with a broad ridge along the centre. 



Fig. 2 d. Another fragment, with a ridge extending a part of the length. 



Fig. 2 e, / Fragments of what may have been stems of this plant. 



Position and locality. This species occurs in considerable abundance near Schoharie, in 

 the bed of the creek, in the central part of the Hudson-river group. I have not seen it 



in any Otlier locality. (State Collection; Cabinet of Mr. Gebhard.) 



316. 4. BUTHOTREPHIS SUBNODOSA ( n. sp. ). 



Pl. LXVIII. Figs. 3 a, b. 



Compare Fucoides antiquus, Brongniart, Hist. Veg. fossiles, Vol. i, pag. 03, tab. 4, fig. 1. 

 — — HisiNGER, Leth. Suecica, 1837, pag. 106, pl. 31, fig. 3 a. 



Frond compressed, branched ; branches opposite or alternate, subnodulose or vesicular, 

 obtuse at the extremities. 



This species is common in the shaly sandstones of the Hudson-river group, in Lewis 

 county. It bears considerable analogy in some of its varieties with the species cited above ; 

 and its associations with the Graptolites of the older shales in Sweden, are very similar to 

 its association in the rocks of New-York. It differs from the slender species of the Trenton 

 limestone in the branches being shorter and subnodulose, and approaches more nearly to 

 the species of the Clinton group. 



Figs, 3 a, b. Figures of imperfect specimens, illustrating the prevailing form of tlie species. 



Position and locality. This species is common in the central part of the group, at Turin 

 and Martinsburgh, Lewis county ; at Loraine, Jefferson county ; and at Pulaski, Oswego 



county. ( l^tate Collection ) 



