PLATE 9 

 Stropheodonta patersoni Hall protype bonamica Clarke 



Page 44 



1-3 Profile, top and posterior views of a specimen with the radial sculp- 

 ture in elementary expression and showing well defined umbonal 

 corrugation 



4-6 Posterior, top and profile views of a specimen with the sculpture 

 characters in more mature development 



Stropheodonta (Brachyprion) schuchertana Clarke 



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7-9 Three views of a typical ventral valve 



10-12 Ventral valves, somewhat incrusted with Monticulipora and 

 Hederella 



Stropheodonta (Brachyprion) major Clarke 



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13-15 Views of the ventral valve 



Strophonella punctulifera (Conrad) 



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1 6 Partial sculpture cast of the interior of the ventral valve 



17 Cardinal view of conjoined valves 



1 8 Ventral view of the conjoined valves 



184 



