Plate 35 



Fig. 1. Sigmomor phina semitecta (Keuss) YSbT. terquemiana iFovnsisim). X 35. 



Gulf of Sidra. 

 2, 3. Sigmomorphina pearceyi Cushman and Ozawa. 2, holotype. Recent, 



Dry Tortugas, Fla., 10 fathoms. X 80. 3, Eocene, Bartonian, 



Val di Lonte, Italy. X 45. a, side view; b, basal view. 

 4, 5. Sigmomorphina crassa (Roemer). X 25. Upper Oligocene, Ahnatal, 



near Cassel, Germany. 



6. Sigmomorphina schencki Cushman and Ozawa. X 35. Oligocene, 



Keasey shale, 1 mile below Keasey post office. Rock Creek, Colum- 

 bia County, Oreg. a, side view; b, basal view. 



7. Sigmomorphina kotoi Cushman and Ozawa. X 45. Upper Pliocene, 



Natsukawa, Province of Echigo, Japan, a, side view; b, basal view. 

 180 



