PLATE 64. 



Plethorhyncha principalis (Hall) 

 Page 241. 



Fig. 1. View of a nearly complete brachial valve. 

 Fig. 2. View of an incomplete brachial valve. 

 Fig. 3. View of a small, rotund, brachial valve. 



Centronella glansfagea (Hall) 

 Page 242. 



Figs. 4, 5. Pedicle and brachial views of a nearly complete specimen. 

 Fig. 6. Brachial view of broader individual. 

 Fig. 7. Pedicle view of large individual. 



Rensselaeria ovoides (Eaton) 

 Page 242. 



Figs. 8, 9. Pedicle views of two small specimens. 



Figs. 10-12. Pedicle, brachial and lateral views of a large, nearly complete specimen. 



Rensselaeria cf. stewarti Clarke 

 Page 243. 



Figs. 13-15. Views of three pedicle valves. 



Beachia suessana (Hall) 

 Page 244. 



Fig. 16. Brachial view of a nearly complete specimen. 

 Fig. 17. Pedicle view of a second nearly complete specimen. 



