CONTRIBUTIONS TO PALEONTOLOGY. 



89 



This species is large and of strong growth, but its full dimensions are 



not known. The specimen figured is apparently nearly entire at the base, 



and we see the whole extent of the stem. It has been thrown down on one 



side, and the side which was below is nearly continuous with the stem, 



expanding only at the sides. On the upper lateral portions the frond is 



abruptly expanded from the stem ; while the central upper line shows the 



frond to be longitudinally slit open either naturally or artificially, and the 



margins recede from the central line as shown in the figure 1, Plate v. The 



expanded frond is again folded inward, one side overlapping the other, and 



its continuation above is broken off. The slit has the appearance of having 



been natural, the margins being neatly defined. If this were true, the form 



of the frond may have been broadly palmate-funnelform below ; and it may 



have extended in a broad ligulate expansion above, after the manner of 



some of the modern Alg^. 



Plate V, Fig. 1. The upper side of the specimen as imbcTdded in the stone, showing the divided 



frond above the stem, and the infolding of the sides. 

 Plate V A, Fig. 1. The opposite side of the same specimen; the top of the frond broken off. 



This species is distinguished from the others in the fragments of stems, 

 by the nearly uniform striae ; and from the larger stems of D. newberryiy 

 by the absence of the stronger radiating and concentric striae, and by a 

 greater expansion at the base of the stem ; while the upper part of the frond 

 is equally distinguishable by the character and size of the striae. 



The specimen figured was collected near Harrisville, Medina county, 



Ohio, from gray shaly sandstone, by the late W. C. Redfield, and first 



placed in my hands in 1849. It was subsequently returned to his collection, 



and has again been kindly loaned to me by 0. B. Redfield, esq. of Albany. 



In the mean time, I have obtained, through Dr, Gr. M. Kellogg, and from 



the collections of Dr. C. A. White, fragments of stems and fronds, of the 



same species, from Richfield, Ohio; but these add very little information 



to that already derived from the original specimen. 



Plate IV, Fig. 5, is a fragment of a stem of the same species, associated with D. newherryi 

 at Richfield, Ohio. 



DICTYOPHYTON CONRADI ( n. s.). 



PLATE V, FIG. 2; AND PLATE V A, FIG. 2. 

 \ 



Body reversed pyramidal, oblique or slightly curving, and expanding 

 from the smaller extremity (base); regularl}^ octangular, with the 

 intervening spaces flattened or slightly concave. Surface cancel- 

 lated by fine threadlike striee, with a stronger depressed tjoncen- 

 tric line at every ten or twelve of the fine strias, and the angles 

 are marked by a more distinct longitudinal groove, as also the 

 centre of the flattened spaces. At the larger extremity on the 

 exterior curve,, the surface has the appearance of becoming no- 

 dose. Longer and shorter diameters about as two to three. 



The figures are two-thirds the natural size ; one a lateral view, and the 

 other a view upon the longer side or outer curve. 



I am indebted to Hon. Samuel Ewinq, of Randolph, Cattaraugus 

 county, for this beautiful species. 



[Senate, No. 115.] 12 



