Boulders of late Cambrian age in conglomerates in Quebec and Newfoundland have been intensively collected and have yielded some 18 species which were referred by Ludvigsen et al. (1989) to either TheodenisiaClark, 1948, or to PeracheilusLudvigsen, 1986. Most specimens are cranidia, rarely having the free cheek in place, and all 3 mm or less in length (sag.). Similar cranidia from strata in Vermont (Clark and Shaw, 1968), Maryland (Rasetti, 1959), Oklahoma (Stitt, 1971), Texas (Winston and Nicholls, 1967) and Alberta (Westrop, 1986) appear to be few...

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