86 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 1 39 



Page 

 8-12, Respectively posterior, anterior, side, dorsal, and ventral views 

 of another symmetrical specimen, X i, hypotype U.S.N.M. 549383a. 

 13-15, Respectively dorsal, anterior, and side views of the preceding, 

 X 2. 16, 17, Two views of cross sections of the beak of the brachial 

 valve U.S.N.M. 549383c, ca. X 8, respectively 2.6 mm. and ca. 6.0 mm. 

 anterior to the beak, showing crura, crural supports, and socket ridges 

 (see pi. 22, fig. 9, and explanation). 



Lower Eocene (Spilecciano), Spilecco, Verona, Italy. 



B. Erymnaria polymorpha (Massalongo) 64 



Figs. 18-25, 31-34. 18-22, Respectively ventral, dorsal, side, anterior, and 

 posterior views of a large but imperfect specimen showing twisted 

 anterior commissure and traces of pallial marks, X x > hypotype 

 U.S.N.M. 75888a. 23, 24, Dorsal and anterior views of the same speci- 

 men, X 2, showing trace of vascula media and tVvisted anterior com- 

 missure. 25, Dorsal view of the same specimen taken under water 

 and tilted away from the observer to show the long crural supporting 

 plates as black lines and the shorter socket ridges, X 3- 31-33, Respec- 

 tively side, anterior, and dorsal views of the preceding specimen, X 2 , 

 showing costae along the anterior margin. 34, Another specimen tilted 

 away from the observer and taken under water to show the trace of 

 the long crural supporting plates and the shorter socket ridges 

 diverging widely from the beak, X 4, hypotype U.S.N.M. 75888b. 



Lower Eocene, Spilecco, Verona, Italy. 

 Figs. 26-30, 35, 36. 26-30, Respectively anterior, ventral, side, posterior, 

 and dorsal views of another specimen, not decorticated like the pre- 

 ceding, and showing, in addition to the twisted commissure, short 

 radial costae, X h hypotype U.S.N.M. 549384a. 35, Posterior of a 

 brachial valve excavated to show cardinalia and crural supporting 

 plates, X 6, hypotype U.S.N.M. 549384b. 36, Another brachial valve 

 interior showing cardinalia with their fairly broad outer hinge plates, 

 and crural supporting plates, X 6, hypotype U.S.N.M. 549384c. 



Lower Eocene (Spilecciano), Spilecco, 400 meters southwest of 

 Purga di Bolca, Monti Lessini, Verona, Italy. 



Plate 19 

 Erymnaria and Streptaria 



A. Erymnaria cubensis Cooper 65 



Figs. 1-10. 1-5, Respectively dorsal, anterior, ventral, posterior, and side 

 views of the holotype, X L U.S.N.M. 549385. 6-8, Respectively side, 

 dorsal, and anterior views of the same specimen, X 2, showing folding. 

 9, Posterior of holotype, X 3, showing conjunct deltidial plates and 

 foramen. 10, Holotype tilted and photographed under water to show 

 crural supporting plates and the shorter, more widely divergent 

 socket ridges, X 3- 



Eocene, 80 meters northeast of school, Chucho Machin, Matanzas 

 Province, Cuba. 



B. Streptaria streptimorpha Cooper, new species 40 



Figs. 11-21. 11-15, Respectively anterior, ventral, side, dorsal, and pos- 



