Q2 PALa:ONTOLOGy OF NEW-YORK. 



FOSSIL PLANTS OF THE TRENTON LIMESTONE 



Plates XXI. & XXII. 



In the soft shaly portions of this limestone, there are considerable numbers of the fucoid- 

 like veo-etable, fig. 1, pi- 22. They often appear as if attached by roots, but are never 

 branched. More rarely species like fig. 1, pi. 21, appear upon the shaly surfaces of the 



limestone. 



Great numbers of obscure vegetable markings, or fragments of fucoid-like bodies, are 

 frequently found in the shaly strata of the Trenton limestone, in nearly all localities where 

 the surfaces are exposed. These bodies are coextensive with the rock, and even much more 

 numerous in some western localities, and in Canada, than within the State of New-York. 



97. 2. BUTHOTREPHIS GRACILIS (n. «;).). 



Pl. XXI. Fig. 1. 



Stem slender, flattened, branched ; branches compressed, leaflike, subdichotomous, 

 diverging, opposite and alternate ; no visible structure. 



This is a beautiful species, very similar to some of the linear-leaved Potamogetons. A 

 carbonaceous film is all that remains of the fossil. It was probably a succulent marine plant, 

 not unlike Fucus, but of a very slender form and habit. It occurs where the crystalline 

 limestone is separated by thin shaly layers, upon which, and upon a shaly carbonaceous 

 film on the limestone, this fossil is found. 



Position and locality. Jacksonburgh and Middleville, Herkimer county, in the central 

 and lower portions of tlie Trenton limestone. C^'"'* Collection.) 



98. 3. BUTHOTREPHIS SUCCULENS ( n. sp.) . 



Pl. XXII. Figs. 2 a, b. 



Fossil composed of thick succulent stems ; stems branching ; branches divergent, bi- 

 furcating ; structure apparently cellulous, indistinct. 



This fossil resembles, in its thick succulent stems, the Salicornia. It is one of the most 

 prominent and remarkable species in tlie rock. 



Tliis is the Lithodcndron dichotomuin of Eaton. 



Fig. 2 a. A portion of a large specimen, the branches scarcely compressed. 

 Fig. 2 b. A single stem with branches, from another plant. 



Position and locality. In the Trenton limestone. Glen's Falls. (Cabinet of the Troy Lyceum.) 



