j6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I39 



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E. Hemithyris psittacea (Gmelin) 45 



Figs. 9, 10. 9, Posterior of a large brachial valve showing cardinalia 

 with the narrow outer hinge plates and slender radulifer crura with 

 the transverse cardinal process at the apex, X 3, hypotype U.S.N.M. 

 111013. 10, Same specimen, X 3, tilted to the side to show the slender 

 radulifer crura with their flattened distal extremity and strengthening 

 ridge on dorsal side. 



Recent, 13 fathoms, Upernavik Harbor, east coast of Greenland. 

 Figs. 11, 12. 11, Posterior of another brachial valve, X 3> tilted to show 

 the long, slender crura and slight development of outer hinge plates, 

 hypotype U.S.N.M. 549379. 12, Side view of the pedicle valve inte- 

 rior belonging to the preceding and showing the inner face of the dental 

 plate and tooth with its corrugations, X 2. 

 Recent, north end of Nunivak Island, Alaska. 



Plate 5 

 Eohcmithyris, Sphenarina, Cryptopora, and Tegulorhynchia 



A. Eohetnithyris alexis Hertlein and Grant 30 



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

 views of a somewhat crushed paratype cracked at the beaks, X i» 

 U.C.L.A. 7257. 



Eocene (Domengine formation), from section line, 2,600 feet south 

 of the northeast corner of sec. 20, T. 28 S., R. 19 E., M. D. B. and M., 

 near headwaters of west branch of Agua Media Creek, McKittrick 

 Quadrangle, Temblor Range, California. 



B. Sphenarina sicula (Seguenza) 62 



Figs. 6-15. 6-10, Respectively dorsal, posterior, ventral, side, and ante- 

 rior views of a well-preserved complete specimen, X 1, showing the 

 strongly triangular outline, hypotype U.S.N.M. 549353a. 11, Dorsal 

 view of the preceding showing the foramen and obscure radial lines, 

 X 2. 12, Posterior of the same specimen, X 4, showing alate conjunct 

 deltidial plates. 13, 14, Two views of the interior of another specimen 

 showing the cardinalia, X 4> with their small outer hinge plates, 

 dental plates and lack of a median ridge or septum in the brachial 

 valve, hypotype U.S.N.M. 549353c. 15, Enlargement of the shell 

 surface, X 6, showing the delicate radial lines, hypotype U.S.N.M. 

 549353b. 



Pliocene, Milasso, Messina, Sicily. 



C. Cryptopora gnomon (Jeffreys) 22 



Fig. 16. Brachial valve tilted to the side, X 8, to show the high median 

 septum and the long maniculifer crura with the distal end handlike 

 and with fingers extended, paratype U.S.N.M. 94367. 

 Recent, 780 fathoms, off Cuba. 



D. Tegulorhynchia. 



Tegulorhynchia squamosa (Hutton) 50 



Figs. 17-24. 17-20, Respectively ventral, dorsal, anterior, and side views 

 of a complete specimen, X 1, hypotype U.S.N.M. 89855a. 21-23, 

 Respectively dorsal, anterior, and side views of the preceding speci- 



