384 E. S. Dana— New twins of Staurolite and Pyrrhotite. 



Umbral limestone in Monongalia Co., W. Va. He thinks that 

 the Myalina and CluEnomya are new species. Also that 'the 

 Lithophaga is so near that referred with doubt to L. lingualis of 

 Phillips, by M. k W., that he cannot distinguish it, although 

 this is a species of the St. Louis group. 



I may state here that the Palmjpteris Jacksoni of the Con- 

 glomerate series, is the typical plant, and very different from 

 the plant found at Lewis Tunnel, and given in my previous pa- 

 per as P. Jacksoni. I have additional specimens from Lewis 

 Tunnel, which show without doubt that, as Professor Andrews 

 has suggested, this latter is a new species. 



It will be seen from the above, that the representatives of the 

 Devonian flora of Canada are quite common in the Conglom- 

 erate Series. The uppermost strata of the Devonian in West 

 Virginia are at least 3500 feet below coal 5 ; and still farther 

 below coal 9, which affords the plants of most decided Devoni- 

 an type. Besides, the forms of Megalopteris, the Paloeopteris^ 



Cordaites Rohhii, 

 The Cordaites has the nervation and termination of the leaves 

 of a Robbii, but I mark it doubtful, as I have no entire leaves. 

 The Sphenopteris adianiorides, is a good deal like the plant fig- 

 ured as Oydopteris ohtusa, by Dawson in the Acadian Geology, 

 although smaller. The plant marked doubtfully Alethopteris 

 ASerlii, is very near A. discrepans. The Sphenopteris allied to 

 *.V. Xewberryi, in its upper pinnae shows the mode of lobing, 

 and has something of the aspect of S. marginata. 



It will be noted that along with these plants we have some 

 of the forms found in coal No. 1 of Ohio. The upper pinnae 

 of the plant identified with Sphenopieris maciUnta I cannot 



have ph 

 ated •' 



from Dawson's Cyclopteris valida. Besides thcvse, 



Art. XLl^i.—Minernlogical Noies ; by Edward S. Dana. No. 

 111.— On new twins of ^Slaurolite and Pyrrhotite. 



1. On Staurolite Crystals from Fannin Co., Georgia. 

 Through i 



in New Haven, some of which show forms which are new 

 and interesting. Pro£ Bradley mentions two distinct localities, 

 visited by him. which afford the staurolite in considerable 

 quantities. The first is at Valley Eiver, near Murphy, Chero- 

 kee Co., North Carolina. The crystals at this place are large 



