20 



Fossils of the Utica Slate, 



Genus — GRAPTOLITHUS Linn^us 1736. 

 Plate I, figures 2, 2a. 

 Geaptolithus anxectaxs n. sp. 



Frond consisting of two slender flexuous stipes which are widely- 

 divergent from a small short obtuse radical. The stipes curve 

 slightly upward at their origin and then outward and obliquely 

 downward ; semi-cylindrical at the base, they become more flattened 

 at the extremities. 



Diameter at and near the base one-half of a millimetre, near 

 the extremities one millimetre. Test strong and thick ; surface 

 apparently smooth. 



Cellules long, narrow, curving gently toward the aperture, making 

 an angle with the axis of the stipe of about 20°. The apertures of 

 the cellules are about one millimetre apart ; the point of the denticle 

 or aperture is falcate curving over the cellule so as to nearly close 

 it midway. The walls of the cellules are thickened giving a tumid 

 appearance to the cell denticle, and forming a small pustule in ad- 

 vance of the base of each cellule. 



The form and proportion of the stipe is similar to that of Grapto- 

 lithus flaccidus, Hall. The cellules are quite different. 



Formation and locality, Utica slate, town of Trenton, Oneida 

 Co., X. Y. 



Genus— DEXDROGRAPTUS Hall 1865. 

 Dexdrograptus simplex n. sp. 



Plate T, figures 5, 5 a, b, 6. 



Stipe long, slender,'flattened. Branches of nearly a uniform char- 

 acter with the stipe bifurcating from it at regular distances ; both 

 celluliferous and noncelluliferous surface apparently smooth. Cellules 

 simple, slightly elongated, depressions, from two and one-half to 

 three millimetres distance from each other, on the central depressed 

 portion of the branches. Substance of the stipe and branches cor- 

 neous and from the evidence of compression probably tubular. 



Formation and locality, Utica slate, town of Trenton, Oneida 

 Co., X. Y. 



