40 The Paleofitologisf. [June lo, 



line farther above, one of the divisions give off a short, outward, lateral 

 branch, at nearly a right angle — probably the other division had a similar 

 branch, but it is broken away just at that place. This is as much as is 

 shown of the Polyzoary, which lies on a small slab of shale, and is a two- 

 edged frond above the first short branch, and nearly round at the base. 

 The base is finely striate, with very small elongate pores, which increase 

 in size upward, till the point above the first branch is passed, where they 

 become of an oval form, their longer diameter being in a longitudinal 

 direction with the stem ; cell wall margins distinct, with a single depressed 

 sinuous line between. The pores are arranged in longitudinal alterna- 

 ting rows, and extend to the lateral margins, which are thin, but not 

 sharp. Four or five cells in the space of half a line, measuring diagonally 

 across the frond, which is half a line, or a little more, wide, and three 

 lines high from the point of the base to the upper part of the example 

 used for this description. 



Named in honor of the late George Graham, of Cincinnati. 



Found in the lower part of the Cincinnati Group, at Cincinnati, about 

 80 feet above low water mark of the Ohio river. 



Ptilodictya dubia, sp. nov. James. 



Polyzoary a flattened, two-edged, branching frond, springing from an 

 attenuated base, gently curving to a height of one line, where a short 

 rudimentary branch is given off; above that point the stem is straight, 

 with alternating lateral branches about half a line apart, standing at 

 nearly right angles Avith the main stem. Surface gently convex to 

 rounded thin edges ; very finely striated, and small pores to a height of 

 one line; above that part the pores are larger, oval in shape, their longer 

 diamater in a longitudinal direction, four or five rows on the main stem, 

 arranged in an alternating manner, and four or five pores in the space of 

 half a line, measuring diagonally across the frond, about their own diam- 

 eter apart, extending to the side margins, there being no nonporiferous 

 border ; mouths of cell walls distinct and slightly raised. 



The example used for this description is half a line wide above the first 

 branch, and a little over two lines high where broken off — full dimensions 

 unknown. The sUice and pores on the base resemble Pt. graJiami, but 

 in other respects it is very different, particularly the branches. 



This may be the lower part and base of sp. Pt. cleavelandi; the sur- 

 face markings of the upper portion, and the lateral branches resembling 

 some specimens of that species, but in the absence of positive evidence 

 it is thought desirable to describe it provisionally at any rate, under the 

 above name. 



Found at Cincinnati, Cincinnati Group, 80 to 100 feet above low water 

 mark of the Ohio river. 



Ptilodictya teres, sp. nov. James. 



Polyzoary a straight or slightly bent, unbranched, two-edged frond, 

 commencing at a pointed base ; the lower part cylindrical, then ex- 



