PLATE XV. 



Fig. 1. — LalruncnUa apiralis ]i. & D. var. hiformis var. ii., f iiat. size, p. 14. 

 Fig. 2.— Style of snme ( X 100). 

 Fir;, ."i. — Discaster with apical spine ( X 700). 

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

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



Figs. G, 7. — Reduc(id discastei-s from anotlier specimen (x IGO). 

 Fig. 8. — Suberites microstoimis R. & D. var. stellatus, var. n., nat. size, p. I'J. 

 Fig. !).— Sub-tyle of same ( X loO) ; 9a (x 400). 

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



Fig. 18. — Surface of S. microslomus var. steUatm, showing stellate poral areas (x 25). 

 Fig. 14. Surface of typical S. microstomus. showinsr circular poral areas (x 25). 

 Fig. 15. — Surface of typical S. caminatm R. & 1)., showing stellate poral areas (x 25). 

 Fig. 16. — Sm-face of S. caminattts R. ^t 1). var. papillatus, var. u., showing papillated stellate poral 

 areas ( x 25), p. 20. 



