NO. 4 CUSHMAN AND MCCULLOCH : SOME VIRGULININAE 229 



EXPLANATION OF PLATE 28 



Figs. 



1-7. Loxostoma instahile Cushman and McCulloch, new species. 

 1, 2, 4-7, X 70. 3, X 60. 1, 2. Paratypes. a, front view ; b, 

 apertural view ; 1. Holotype. 



8. Loxostoma limbatum (H. B. Brady), x 60. 



9, 10. Loxostoma limbatum (H. B. Brady), var. costulatum (Cush- 

 man). X 60. a, front view; b, apertural view. 



11, 12. Loxostoma mayori (Cushman). x70. a, front view; b, aper- 

 tural view. 



13-19. Bifarina hancocki Cushman and McCulloch, new species. 

 13, 14, 17-19, x90. 15, 16, x 120. 13. Holotype. 14. Paratype. 

 a, front view; b, apertural view. 



20. Bifarina pacifica Cushman and McCulloch, new species. 

 X 120. Holotype. 



