PLATE 16 



Reticularia fimbriata (Conrad) 

 Page 105. 

 Figs. 1 and 2. Two views of a pedicle valve. 



(Mineola of Montgomery County.) 



Cranaena calvini (Hall and Whitfield) 

 Page 94. 



Fig. 3. Brachial view of a small specimen with an unusually straight hinge line. 



(Snyder Creek shale of Callaway County.) 

 Figs. 4 and 5. Brachial and side views of a small specimen. 



(Snyder Creek shale of Callaway County.) 



Martinia halli Branson 

 Page 106. 



Figs. 6-8. Brachial, pedicle, and side views of an average specimen. (X2). 

 (Callaway limestone of Moniteau County.) 



Cyrtina missouriensis (Swallow) 

 Page 108. 



Fig. 9. Cardinal area of an average specimen. (X2). 



(Callaway limestone of Callaway County.) 



Pugnoides altus (Calvin) 

 Page 92. 



Figs. 10-12. Brachial, pedicle, and side views of an average specimen. (X2). 

 (Snyder Creek shale of Callaway County.) 



Pugnoides swallovi Branson 

 Page 92. 



Figs. 13 and 14. Brachial and side views of an unusually gibbous specimen. (X2). 



(Mineola of Montgomery County.) 

 Fig. 15. Brachial view of a small specimen from the same locality as Figs. 14 and 

 15. (X2). 



Pentamerella arala (Conrad) 

 Page 87. 



Fig. 16. A view of the cardinal area and beak of the pedicle valve of an impeifect 

 specimen. (X2). (Mineola ot Rails County.) 



Gypidula marionensis Greger 

 Page 89. 



Figs. 17-19. Side, brachial, and pedicle views of an average specimen. (X2). 



(Cooper limestone of Marion County). 

 Fig. 20. Beak and area of pedicle valve of an imperfect specimen. (X2). 



(Cooper limestone of Marion County.) 



Pentamerella fultonensis Branson 

 Page 88. 



Figs. 21-23. Pedicle, brachial, and side views of an average specimen. (X2). 

 (Callaway limestone of Callaway County.) 



