154 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 6 



All illustrations were made by Miss Ann Shepard. 

 EXPLANATION OF PLATE 17 



Figs. 



1. Nonion depressulum (Walker and Jacob), var. matagor- 

 danum Kornfeld. X 80. a, side view; b, apertural view. 



2. Nonion grateloupi (d'Orbigny). X 60. a, side view; b, 

 apertural view. 



3. Nonion incisum (Cushman). X 90. a, b, opposite sides; c, 

 apertural view. 



4, 5, Nonion hancocki Cushman and McCulloch, new species. X 

 35. 4, Holotype. a, side view; b, apertural view. 5, Para- 

 type. 



6,7. Nonionella auricula Heron-Allen and Earland. 6, X 60; 

 7, X 40. aa, bb, opposite sides; cc, apertural views. 



8, 9. Nonion pizarrense W. Berry, var. basispinatum Cushman 

 and Meyer. 8, X 60; 9, X 45. aa, bb, opposite sides; cc, 

 apertural views. 



10. Nonionella japonica (Asano), var. mexicana Cushman and 

 McCulloch, new variety. X 80. a, b, opposite sides; c, 

 apertural view. 



11, 12. Nonionella decora Cushman and McCulloch, new species. 

 11, X 60. Paratype. 12, X 45. Holotype. aa, bb, opposite 

 sides; cc, apertural views. 



