368 P. E. Raymond — Fauna of the Chazy Limestone. 



Comparing the large percentage of forms common to the 

 Stones River and to the Black River and Trenton with the 

 low percentage — less than 5 per cent — of forms common to 

 the Chazy and Trenton, it becomes evident that the Stones 

 River and Trenton are fannally much more closely connected 

 than are the Chazy and Trenton. This close relationship of 

 the fauna of the Stones River to that of the Trenton, coupled 

 with the stratigraphy, suggests that the whole Stones River is 

 younger than the Chazy. 



East Tennessee. 



In east Tennessee the Maclurea limestone was correlated by 

 Safford" with the Chazy or Black River of New York and 

 Canada. While a large part of this limestone seems to be of 

 Trenton age, a section around Lenoirs has afforded the writer 

 a small fauna containing fossils characteristic of Division 2 in 

 the Lake Cham plain region. This region needs further study 

 before definite correlations are made. 



Description of New Species. 



brachiopoda. 



Lingulei columba sp. nov. 



Shell small, oval in outline, gently and uniformly convex. 

 There are no flat slopes and the front is semi-circular in out- 

 line. The posterior end is somewhat triangular, the beaks 

 pointed. The surface is covered by very numerous and promi- 

 nent concentric striae, no radiating lines shoAving except when 

 the surface is exfoliated. 



One specimen is 10 mm long and T mm wide; another is 7 mm 

 long and 5 mm wide. 



Locality. — East side of Valcour Island at Chazy, and on 

 Isle La Motte. Type in Yale University Museum. 



Camarotoechia pristina sp. nov. 



Shells small, transversely oval to subcircular in outline. 

 Both valves moderately and uniformly convex. The dorsal 

 valve has a low fold and the ventral valve a shallow sinus, 

 which is noticeable only toward the front of the shell. There 

 are iO to 14 strong rounded plications, 4 on the dorsal fold and 

 3 on the sinus. The 2 plications in the middle of the fold are 

 smaller than the 2 outside ones and the median plication of the 

 ventral valve is the weakest, which is the direct opposite of the 

 state found in Camarotwehia orientalis. 



Locality. — Valcour Island and Chazy, New York. The 

 type is in the Carnegie Museum. 



* Geol. Tennessee, 1869, p. 236. 



