PLATE XV. 



Fig. 1. — LatruncuUa apicalis R. & D. var. Mformis var. n., f nat. size, p. 14. 

 Fig. 2.— Style of same ( X 100). 

 Fig. 3. — Discaster with apical spine ( x 700). 

 Fig. 4. — Discaster without apical spine (x 100) ; 4a (x 700). 

 Fig. 5. — Eeduced discaster ( x 100). 



Figs. 6, 7. — Reduced discasters from another specimen ( X 160). 

 Fig. 8. — Suberites microstomiis E. & D. var. stellatus, var. n., nat. size, p. 19. 

 Fig. 9.— Sub-tyle of same (x 100) ; 9a (x 400). 

 Figs. 10, 11, 12.— Cortical tyles (x 100). 



Fig. 18. — Surface of S. microstomus var. stellatus, showing steUate poral areas (X 25). 

 Fig. 14. — Surface of typical S. microstomus, showing circular poral areas ( x 25). 

 Fig. 15. — Surface of typical S. caminatus R. & D., showing stellate poral areas (x 25). 

 Fig. IB. — Surface of S. caminatus R. & D. var. papillatus, var. n., showing papillated stellate poral 

 areas ( X 25), p. 20. 



