NO. 3 CUSHMAN AND MCCULLOCH: SOME NONIONIDAE 157 



EXPLANATION OF PLATE 18 



Figs. 



1. Nonionella miocenica Cushman. X 85. a, b, opposite sides; 

 c, apertural view. 



2. Nonionella miocenica Cushman, var. Stella Cushman and 

 Moyer. X 60. a, b, opposite sides ; c, apertural view. 



3. Nonionella basiloba Cushman and McCulIoch, new species. 

 X 80. a, b, opposite sides; c, apertural view. 



4, 5. Nonion pizarrense W. Berry, var. basispinatum Cushman 

 and Moyer. X 35. aa, bb, opposite sides; cc, apertural 

 views. 



6-10. Cushmanella primitiva Cushman and McCulloch, new spe- 

 cies. 6, Holotype. X 60; 7, X 85; 8, 10, X 60; 9, X 40. 

 aaa, bbb, opposite sides ; ccc, apertural views. 



11. Astrononion stellatum Cushman and Edwards. X 60. a, 

 side view ; b, apertural view. 



12. Astrononion viragoense Cushman and Edwards. X 60. a, 

 side view; b, apertural view. 



