54 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 6 



EXPLANATION OF PLATE 5 



Figs. 



1,2. Ammodiscus pacificus Cushman and Valentine. 1, X 10. 



Microspheric. 2, X 13. Megalospheric. a, a, front views; 



b, b, apertural views. 



3,4. Ammodiscus minutissimus Cushman and McCulloch, new 

 species. 3, X 50. a, front view; b, apertural view. Holo- 

 type. 4, X 90. Microspheric. Paratype. 



5,6. Glomospira gord'talis (Jones and Parker). 5, X 110. 6, 

 X 70. a, a, front views; b, b, apertural views. 



7. Haplophragjioides advenum Cushman. X 18. a, front 

 view; b, apertural view. 



8-10. Haplophragmoides columbiense Cushman. 8, 10, X 50. 9, 

 X 70. a, a, front views; b, b, apertural views. 



11, 12. Haplophragmoides columbiense Cushman, var. evolutum 

 Cushman and McCulloch, n. var. 11, X 40. Holotype. 12, 

 X 70. Paratype. a, front view; b, apertural view. 



