EXPLANATION OF PLATES 



Plate i 



Cryptopora 



Page 



A. Mannia nysti Davidson = Cryptopora nysti (Davidson) 22 



Figs. 1-14. 1, Dorsal view of a complete specimen showing triangular 

 outline, X 10, hypotype U.S.N.M. 549422a. 2, Same view as preced- 

 ing, X 20, showing strongly elevated deltidial plates and large tri- 

 angular foramen. 3-5, Respectively partial side, side, and ventral 

 views of the same specimen showing the profile and large deltidial 

 plates, X 10. 6, Interior of the pedicle valve of the same specimen 

 showing teeth and deltidial plates, X 10. 7, Interior of the brachial 

 valve of the same individual showing high, narrow median septum, 

 and crura with flattened distal extremities, X 10. 8-10, Respectively 

 interior, partial side, and side views of the same valve, X 20, showing 

 median septum and details of the cardinalia. 11, 12, Interior and par- 

 tial side views of another pedicle valve interior, X 10, showing teeth 

 and deltidial plates, hypotype U.S.N.M. 549422b. 13, 14, Partial side 

 and anterior views of the preceding specimen, X 2 <>, showing dental 

 plates, apical plate and deltidial plates. 



Upper Miocene (Diestien-Sables de Deurne), Wommelghem, east 

 side of Antwerp, Belgium. 



B. Cryptopora rectimarginata Cooper, new species 20 



Fig. 15. Dorsal view of a complete specimen showing alate deltidial 

 plates and apical plate, X l 5, paratype U.S.N.M. 274143d. 

 Recent, Eolis Station 340, at 209 fathoms, off Fowey Light, Florida. 

 Fig. 16. Another specimen showing the alate deltidial plates and apical 

 plate, X 15, paratype U.S.N.M. 274168a. 



Recent, Eolis Station 320, at 80 fathoms, off Western Dry Docks, 

 Florida. 

 Figs. 17, 18. Respectively tilted to the side and full views of a specimen 

 showing elaborate alae on the deltidial plates, X *5, paratype 

 U.S.N.M. 336896a. 

 Recent, Eolis Station 378, at 165 fathoms, off Fowey Light, Florida. 

 Fig. 19. Interior of a pedicle valve with tooth broken on right side 

 but showing alae with scalloped edges on deltidial plates and the large 

 plate just anterior to the apex, X I5> paratype U.S.N.M. 336895a. 

 Recent, Eolis Station 377, at 190 fathoms, off Fowey Light, Florida. 



Plate 2 



Cryptopora and Neorhynchia 



T. Cryptopora rectimarginata Cooper, new species 20 



Figs. 1- 1 1. 1-3, Respectively dorsal, side, and anterior views of a com- 

 plete specimen, X 6, showing rectimarginate commissure, holotype 



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