NO. 5 RHYNCHONELLOID BRACHIOPODS — COOPER 85 



Plate 17 



Probolarina 



Page 



A. Probolarina salpinx (Dall) 38 



Figs. 1-19. 1-5, Respectively, posterior, ventral, side, dorsal, and anterior 

 views of a small but complete individual, X 2 . hypotype U.S.N.M. 

 549357a. 6, 7, Dorsal and ventral views of another hypotype showing 

 variation of costation, X i> U.S.N.M. 549355. 8-10, Respectively dorsal, 

 ventral, and anterior views of a specimen larger and more strongly 

 costate than the two preceding ones, X h hypotype U.S.N.M. 549357b. 

 11-14, Respectively side, anterior, ventral, and dorsal views of a small 

 specimen with few costae, X 3, holotype U.S.N.M. 109293a. 15, Apical 

 portion of a large specimen showing the small submesothyrid fora- 

 men, conjunct and auriculate deltidial plates, X 4, hypotype U.S.N.M. 

 549354a. 16, Interior of a brachial valve, X 3, showing cardinalia, 

 hypotype U.S.N.M. 549356d. 17, 18, Partial side and full views of the 

 apical part of the same specimen, X 6, showing the concave falcifer 

 crura and large outer hinge plates. 19, The same tilted anteriorly to 

 show the concave crura and lack of median ridge, X 6. 



Eocene (Castle Hayne formation), at the city quarry near the 

 cemetery, Wilmington, North Carolina. 



B. Probolarina holmesii ( Dall) 38 



Figs. 20-36. 20-24, Respectively posterior, anterior, dorsal, ventral, and 

 side views of a complete specimen, X 2 > hypotype U.S.N.M. 549359a. 

 25, The same, X 3» showing the ornamentation and long beak. 26, 27, 

 Beak of the same specimen, X 5, showing conjunct and strongly auric- 

 ulate deltidial plates. 28, Small specimen showing foramen and con- 

 junct deltidial plates, X 4, hypotype U.S.N.M. 549359b. 29, 30, Apical 

 part of another specimen showing conjunct and auriculate deltidial 

 plates, X 6, and the same tilted to show the dental plates and pedicle 

 collar, X 6, hypotype U.S.N.M. 549359c 31, The same tilted to the 

 side to show the pedicle collar, X 4- 32, Apex of another pedicle 

 valve showing strongly auriculate deltidial plates, X 6, hypotype 

 U.S.N.M. 549359f. 33, Interior of the brachial valve, X 3> showing 

 cardinalia and absence of median ridge, hypotype U.S.N.M. 549359g. 

 34. 35) Apical part of the preceding tilted to show concave falcifer 

 crura, X 6. 36, Same in full view to show the outer hinge plates, X 6. 

 Horizon and locality same as above. 



Plate 18 



Erymnaria 



A. Erymnaria bolcensis (Massalongo) 64 



Figs. 1-17. 1-5, Respectively dorsal, side, posterior, anterior, and ventral 

 views of a decorticated specimen showing symmetrical form, X x » 

 U.S.N.M. 549383b. 6, Posterior view of preceding, X 3, to show 

 dorsal umbo, trace of the crural supporting plates, and the shorter 

 socket ridges outside of them (photographed under water). 7, Anterior 

 of same specimen, X 2 > showing symmetrical fold on brachial valve. 



