116 PALEONTOLOGY OF OHIO. 



Genus RHYJS"CH0NELLA, Fischer. 

 Rhynchonella scobina. 



RhyndioneUa negJecta, var. scohina, Meek; Am. Jour. Sci. and Arts, Vol. IV., p. 277, 



3d series, 1872. 

 Rhynchonella neglecta, Meek ; Pal. Ohio, Vol. I., p. 179, pi. 15, fig. 3. 



In the American Journal, loc. cit., Mr. Meek describes a species of 

 Rhynchonella from the Clinton group, at Dayton, Ohio, under the name 

 R. neglecta, var. scobina, but in the Paleeontoiogy of Ohio, as cited above, 

 he drops the varietal name and fully identifies his shell with R. neglecta, 

 Hall, from the Niagara formation of New York, principally on the evi- 

 dence furnished by a minute surface character beautifully seen on the 

 Ohio shell, stating that he had detected a similar texture on New York 

 specimens of R. neglecta, loaned by Prof. Hartt, of Cornell University. 

 We have examined, and in vain, many examples of well preserved R. neg- 

 lecta from New York, and among them the original specimens used in 

 description, to find any thing approaching the surface features of the 

 Ohio species, and feel inclined to believe that the examples from New 

 York on which the structure referred to was detected were young speci- 

 mens of R. cuneata, a species very much more closely related to the shell 

 under consideration than R. neglecta, and one on which this same struc- 

 ture is very strongly marked. But the shell differs, however, in the 

 larger and adult individuals, in the peculiar character of the beak and 

 area beneath it, from the Ohio specimens ; still the short, broad forms of 

 R. cuneata may very readily be mistaken when compared with the others, 

 and the young would be difficult to separate. We, therefore, propose to 

 restore the Ohio shell to its proper standing as a species, under the name 

 R. scobina. 



LAMELLIBRANCHIATA. 



Genus OYPRICARDITES, Conrad. 



ClPRICARDITES FERRUGINEUM (ll, Sp.). 



Plate 5, fig. 11. 



Shell somewhat above the medium size, obliquely broadly ovate in out- 

 line, Avith very ventricose valves, and rather small, appressed beaks, 

 which project but little above the cardinal line. Hinge line short, less 

 than half the entire length of the shell ; rounded at the posterior end, 

 and gradually passing into the posterior border, which is somewhat 



