PLATE i 

 Dalmanites micrurus Green 



Page 18 



1 A cephalon with characteristic border and lobation 



2 Right free cheek with usual ornamentation 



3 A somewhat distorted pygidium 



Proetus sp. 



Page 19 



4-6 Pygidia probably representing distinct species, x 3 

 Bronteus barrandii Hall var. major Clarke 



Page 18 



7 Pygidium, natural size 



Pterygotus sp. 



Page 1 8 



8 Fragment of a thoracic segment 



Orthoceras cf. longicameratum Hall 



Page 21 



9 Upper or concave surface of one of the siphuncular beads, x 2 



Opercula of Euomphalus ? 



Page 25 



10-12 Three examples showing the concentric surface 



Platyceras sp. 



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13 A deeply furrowed shell comparable to P. retrorsum Hall 

 Holopea cf. antiqua Vanuxem var. pervetusta Conrad 



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14-16 Three shells, natural size 



Holopea enjalrani Clarke 



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17-19 Three views of a typical example, x iy 



Holopea enjalrani var. corrugata Clarke 



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20 A corrugated variety of the preceding 



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