PLA TE IX— Continued. 

 Smithia Johanni H. di- W. 



Page 334. 

 Fig. 10. Several calyces of this species. (Natural size.) 



ACERVULARIA INEQUALIS H. & W. 

 Page 233. 

 Fig. 11. A portion of a large specimen, showing the general form and unequal size 

 of the cells. 

 " 12. Enlargement of three individual cells as seen in a transverse section. The 

 inner wall is represented only by a closer arrangement of the concentric 

 partitions and a ring of greater density, caused apparently by the distribu- 

 tion of spiculse. 



CHoyoPHYLLUM {Ptychophyllum) ELLIPTWUM H. & W. 



Page 233. 

 KiG. 13. Lateral view of a large individual, showing the subtortuose form. 



