Plate 33 



Fig. 1. Sigmomorphina regularis (v. Miinster). X 12. Upper Oligocene, 

 Ahnatal, near Cassel, Germany, a, side view; b, basal view. 



2. Sigmomorphina frondiciilariformis (Galloway and Wissler). X 35. 



Pliocene, Timms Point, San Pedro, Calif, a, side view; b, basal view. 



3. Sigmomorphina torta (Galloway and Wissler). X 45. Pleistocene, 



Lomita quarry, Palos Verdes Hills, Calif. 



4,5. Sigmomorphina semitecta (Keuss) var. terquemiana (For naisini). 4, Plio- 

 cene, Castel Arquato, Italy. X 80. a, b, side views; c, basal view. 

 5, Eocene, Lutetian, middle bed, Grignon, France. X 80. 



6, 7. Sig?no?norphina semiteda (Reuss). X 65. Miocene, Burdigalien in- 

 ferieur, de I'Eglise, Saucats, France, a, b, side views. 7, young. 



178 



