NATURAL SCIENCES OF PHILADELPHIA. 67 



Phillips, from the Carboniferous. Indeed it might even be referred 

 to S. biarmica, with more propriety' than a Kansas Coal-measure 

 species that has been so referred by Prof Geinitz. Compared 

 with the figures of the original Russian example of S. biarmica, 

 figured in the Palaeont. of Russia and the Ural Mountains, pi. xix. 

 fig. 4 a and 4 6, our shell is seen to be proportionally somewhat 

 more depressed and longer, with the beaks a little less prominent, 

 and farther removed from the shorter or posterior extremity. 

 Its posterior dorsal slope, even in the internal cast, is also less 

 oblique. In this latter character it is even less like the Eno-Ush 

 and German Permian forms referred to S. biarmica. 



I have elsewhere (Proceed. Acad. Xat. Sci., April, 1810, p. 44) 

 expressed the opinion that these Palaeozoic shells usually re- 

 ferred to Solenomya, may yet have to be separated from that genus, 

 and ranged under Prof. King's name Janeia, notwithstanding the 

 fact that he subsequently abandoned his genus, under the impres- 

 sion that it is not distinct from Solenomya. I still think it proba- 

 ble that this may have to be done. 



Locality and jjosiiion. Dublin, Franklin Co., Ohio. Cornife- 

 rous group, of the Devonian. 



CLINOPISTHA ANTIQTJA, Meek. 



Shell very thin, transversely suboval, gibbous, with flanks along 

 the middle near the lower margin, somewhat flattened or slightly 

 concave; more than half as high as long. Anterior or longer 

 side regularly rounded in outline ; posterior sloping above from 

 the beaks to the narrowly rounded extremity, which is most 

 prominent below the middle; basal margin straightened or broadly 

 sinuous along the central region, and rather abruptly rounded up 

 at the extremities ; beaks depressed nearly or quite to the dorsal 

 outline, and placed about half-way between the middle and pos- 

 terior extremity ; dorsal outline nearly horizontal and parallel to 

 the base, in front of the beaks, but rounding regularly into the 

 anterior margin. Surface merely showing moderately distinct 

 lines of growth, with some obscure traces of radiating striae when 

 a little worn near the base; these last-mentioned markings being 

 more distinct on the internal cast. 



Length, 0.82 inch; height, 0.51 inch; convexity, 0.39 inch. 



I have been much surprised, to find among the collections from 

 the Corniferous limestone, a shell agreeing so exactly as this in all 

 18T1.] 



