226 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 6 



EXPLANATION OF PLATE 27 



Figs. 



1, 2. Bolivina subadvena Cushman, var. serrata Natland. x 120. 



a, front view ; b, apertural view. 



3, 4. Bolivina subexcavata Cushman and Wickenden. x 145. 



5, 6. Bolivina torqueata Cushman and McCulloch, new species. 

 X 120. 5. Holotype. 6. Paratype. a, front view; b, apertural 

 view. 



7-11. Boli'vina tongi Cushman, var. filacostata Cushman and Mc- 

 Culloch, new variety. 7-9, 11, x 120. 10, x 145. 7. Holotype. 

 9, 11. Paratypes. a, front view; b, apertural view. 



12. BoUvina tortuosa H. B. Brady, x 145. a, front view ; b, aper- 

 tural view. 



13, 14. Loxostoma convallar'tum (Millett). x 145. 



15-17. Loxostoma instabile Cushman and McCulloch, new species. 

 X 70. 15. Holotype. 16, 17. Paratypes. a, front view; b, aper- 

 tural view. 



