262 Forty- SIXTH Report on the State Museum. 



In loose specimens of calcareous rock, which may be fragments from 

 what Prof. Hall calls " calcareo-arenaceous bands * " were found 

 numerous specimens of apparently typical Rhynchonella congregatay 

 Conrad. In association with the preceding species are specimens of a 

 smaller Rhynchonella, which may be the young of R. congregata, 

 Conrad, but resembles closely R, prolifica, Hall. Sjnrife/i' viedialis^ 

 Hall occurs with the Rhynchonellas. Splrophyton velum, Vanuxem 

 was noticed in loose sandstone slabs.f 



A 498 B is an exposure in a brook on the western side of the Unadilla 

 river, about one mile southwest of Unadilla forks in Brookfield, Madison 

 county. The rocks are shales which contain more arenaceous than 

 argillaceous material. Fossils are not abundant. The fauna is : 



Ghonet^s coronata, Conrad. 



Liorhynchiis imLltmosta^ Hall. 



Paracyclas lirata, Conrad. Several of the specimens very much 

 distorted by pressure. 



Spirifer mucronatus, Conrad. Small specimens of evidently this- 

 species. 



Pakeonello constricta, Conrad. 



Coral. 



Athyris spirifer oides, Eaton. 



Rhynchonella sp. 



Tropidoleptus carinatus, Conrad. (?) 



Upon lirvSt examination this specimen was identified as Chonetes 

 nmcronata. Hall, but more careful study seems to confirm the above 

 determination. Apparently no trace of cardinal spines is preserved, 

 and near the margin the impression shows the presence of pustules. 

 About ten of the central strije bifurcate near the margin of the shell. 

 The resemblance of C. mucronata, Hall, to the young oi^T. car hiatus y 

 Conrad was noticed by Prof. Hall. J 

 Chonetes sp. 



JPleurotoniaria. 



Fragments of some other .species. 



A short distance south of Lloydsville hamlet in Plainfield, Otsego 

 CO., and one-|-mile south of 498 A. is 498 D. There is an exposure of 

 20' of shales in the bed and by the side of a small creek. These shales, 

 are not coarse but split up into irregular fragments. About 10' from 



*Pal. N. Y., vol. iv. p. 342. 



1 See Geol. Rep't ad Dist. N. Y., pp. 176, 177 : also 16th Ann. Rep't. N. Y. State Cab. Nat. Hist., 

 pp. 80, 82. 

 $Pal. N. Y., vol. iv, p. 125. 



