18 PKOCEEDINGS OF THE N^ATIONAL MUSEUM vol. 76 



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 Tuzoia praemorsa, new species 10 



Fig. 2. Valves opened out. Keel, with frill, of right valve fully extended. 

 Outer portion of left valve crushed down almost vertically. 

 Fragment of soft body of some undetermined form at rear. 

 Paratype, Cat. No. 80488, U.S.N. M. 



Middle Cambrian, Burgess shale; (loc. 35k) near Field, 

 British Columbia. 



Tuzoia getzi, new species 10 



3. Dorsal view of opened valves. Seven spines along dorsal line 

 well shown. Impression of interior, beyond keel, of left valve 

 shown near bottom of picture. Keels with frills flattened out. 

 Holotype, Peabody Museum, Yale University, No. 10044. 



Lower Cambrian, Kinzers formation; (loc. 12x), near Rohrers- 

 town, Pennsylvania. 



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