REPORT OF THE STATE PALEONTOLOGIST 1902 1049 



what exceeding them in width. These lines are not visible in 

 exfoliated specimens. 



This species is most nearly related to C. neglecta of the 

 Niagaran of New York. It differs from that species in 

 the more pronounced triangularity of the pedicle valve, the con- 

 cavities on the lateral slopes below the beak, which give the 

 valve somewhat the aspect of Rhynchotreta cuneata, 

 the greater difference in convexity between the two valves and 

 the fewer and less strongly pronounced lateral plications. The 

 western representatives of C. neglecta have the median 

 elevation and depression too pronounced, and the plications too 

 sharp to correspond with our species, though the form and rela- 

 tive convexity of the pedicle valve are more nearly like that of 

 the present species. On the whole, the two species are readily 

 distinguished. 



This species is abundantly represented in the upper Stromato- 

 pora bed of the Manlius limestone at Beeraft mountain. 



In the collection in the American Museum of Natural History 

 containing some of the typical Coralline limestone fossils from 

 Schoharie N. Y. this species is represented by a type more 

 nearly like C. neglecta of the New York Niagaran. This 

 has recently been described by Schuchert 1 as Rhynchonella 

 litchfieldensis. The type specimen 2 erroneously figured 

 asAtrypa lamellata, differs from our species as follows. 

 The valves are more equally convex, the pedicle valve is less 

 sharply constricted below the beak making the appearance less 

 triangular. The median depression is faint, except near the 

 front. It contains three plications which are like those of 

 C. hudsonica. The character of the plications in general 

 is like that ofC. hudsonica, but there are about nine or 10 

 on each side of the depression, the outer ones fine but sharp. On 

 the brachial valve of the four central elevated plications the 

 median two are somewhat more raised. The number of lateral 

 plications on each side is 10, the outermost fine and short. 



1 Am. Geol. 1903. 31:67. 



2 Palaeontology of New York, v.2, pi. 74, fig. llh and i. 



