PALEZONTOLOGY OF NEW-YORK. 
314 
1 a. A portion of a large specimen, with the smaller extremity broken off: 
. 1 &. Section of the last. 
1 c. A smaller specimen, very perfectly terminated at both extremities. 
. | d. A minute specimen of the same species. 
Position and locality. These specimens (1c and d ) are from the semi-altered slates near 
Waterford. The other specimen is from the calcareous beds associated with the same slate, 
near Troy. 
