DETAILED GEOGKAPHIC DISTRIBUTION. 



115 



Geographic distribution of North American species of Cambrian Brachiopoda — Continued. 



Note. — The letters placed opposite each species in the various columns denote the State or province in which the species occurs; for instance, 

 a"C'* in column 2 under A indicates that the species occurs in Cape Breton, "CN" indicates that it occurs in both Gape Breton and New 

 Brunswick. 



