NORTH AMERICAN GRAPTOLITES 293 
NOTES TO CAMBRIAN TABLE. 
G signifies #de R. R. Gurley. 
L signifies #de Charles L.apworth.4 
M signifies 7de G. F. Matthew.? 
P signifies fde H. A. Prout.5 
W signifies 7de C. D. Walcott.* 
‘Walcott, Bull. 30, U. S. Geol. Surv., 1886, pp. 92-94. 
? Matthew, List of Fossils found in the Cambrian rocks in or near Saint John, N. 
B., 1892, p. vi. 
3 Matthew, Trans. N. Y. Acad. Sci., 1895, pp. 262-273, Pls. XLVIII.-XLIX. 
4 Lapworth, Trans. Roy. Soc. Can. for 1886, V, sect. IV., p. 168. 
5 Prout, Amer. Journ. Sci., 1851, XI., p. 187. 
©The shales are of Sillery age (jie Ells; see Walcott, Proc. U. S. Nat. Mus., 
1894, XVII., p. 313) and should probably be placed at a higher level in (perhaps at 
the summit of) this table (c£ Walcott, Amer. Jour. Sci., 1890, XXXIX., pp. 112-114.) 
