1 879-] The Paleontologist. 21 



double lines is a row of oval or circular pores; above that point the i)ores are 

 nearly circular and arranged in sinuous rows. About 3 lines above the base 

 two rows of nodes commence, which increase to 4 rows at about half the 

 length of the Polyzoary. The nodes are prominent, in appearance like small 

 cones, a little over one line apait from one apex to another; the sides of the 

 nodes carry the same sized cells as on the general surface, but the tops have 

 many very small puncture like openings. About 8 cell apertures in the space 

 of a line measuring in cither direction, which extend to the edges of the frond, 

 there being no striated or solid borders. The center of the frond, longitu- 

 dinally, is somewhat convex, but flattens out rather abruptly above the base to 

 thin edges. 



A small portion of the upper part of the specimen here described is covered 

 with the rock on which it lies, otherwise it seems to be perfect, and finely pre- 

 served, (the one side). Another smaller example, not so well preserved, has 

 the upper part broken away. 



Locality and position — Lower Silurian, Cincinnati Group, Clinton Co , O. 

 Collected by Dr. L. B. Welch of Wilmington, O., in whose fine cabinet the 

 specimens now are. 



Ptilodictya platyphylla. (sp. nov.) (James.) [platyphilla — expandedleaf-like.) 



Polyzoary consisting of a thin, unbranched, two-edged frond, starting from 

 a pointed base and expanding rapidly outward and upward; from ^/^ a line to 

 one line in thickness in the center, to thin sharp edges at the borders, and a 

 central laminar axis; celluliferous on both faces Surface covered with con- 

 spicuous rounded tubercles about one line apart, measuring from center to 

 center. Cell apertures oval, about 7 in the space of one line measuring their 

 longer diameter, and arranged in rows between quite strong, comparatively, 

 elevated lines ; the tops of the tubercles have more or less rather inconspicuous 

 minute pores in the specimens so far examined. 



Most examples obtained of this species are divided at the central axis, 

 showing, in some cases, the bases of the rows of cells and the parallel lines 

 between through a thin film, and very fine concentric striae ; in other cases 

 the film and concentric striae have been removed, showing the parallel lines 

 more plainly, and the bases of the cells have a subimbricating diamond shape 

 or pointed appearance. 



In some cases of ca^^ts (or moulds) of the outer surfaces the calices have left 

 prominences, and the parallel lines and tubercles depressions, which give the 

 specimen a very pretty appearance under a magnifier of low power. 



The examples used for this description are not entire in any case; the largest 

 is about two inches across at the broadest part, irregular in outline and partly 

 covered by the rock in which it is imbedded ; all are broken away at some 

 point. Full dimensions unknown. All are more or less covered with the rock 

 which seems to have formed nround the Polyzoary The central axis is 

 generally shown, the outer surfaces much less frequently, owing, seemingly, to 

 the stronger adhesion to the rock. No detached specimens observed. 



Position and locality — Upper Silurian, Clinton Group, Clinton Co., O. 



GENUS ESCHARINA, (Milne-Edwards.) 



Escharina (?) distorta. (sp. nov.) (James) {distorta — distorted.) 

 Polyzoary consists of thin expansions, contorted and curved in almost every possible 

 manner; celluliferous on both faces, and a central laminar axis, which is finely striated in 

 one direction and more coarsely transversely; some of the transverse striae or wrinkles are 

 quite strong and more prominent than others. The series of finer striae, as seen on the 

 most jDerfect specimens, bifurcate frequently and sometimes anastomose, and seem to radiate 

 from different points in various directions; the transverse lines or wrinkles are concen- 

 trically arranged, and are more or less sinuous. 



The cell walls at the outer surface of the only specimens observed showing that feature, 

 are abraded. Calices oval or circular and arranged, sometimes, in short, straight or curved 

 rows in different directions, 5 or 6 in the space of one line including interspaces ; dis-* 



