PLATE IX. 



Fio. 1. — Cmifhyra barhatn Solhi*;, 1 nat. size, ji. i;. 



Fir.. 2. — Vertical section throiijrh an oscule ( X i")). 



FiCt. 3. — Young sijecimcn with onu poiviciilyx in front and one oscule at tlie ujiper end ( x 8). 



Fig. 4. — Cortiail oxea from a larse specimen (x l(iO). 



Figs. 5-7. — Single and double "silica pearls" (x 700). 



Figs. 8-12. — "Silica pearls" around whicli crystals of sea-salts have become deposited (x 42.">). 



Figs. 13, 14.- Spheroidal masses of sea-salt crystals (in uptical section), which stain deeply in carniin( 



(X 42:.). 

 Fii;. 1.5. — Ciunidla smjitta var. micromgnui, vertical section of cortex in poral region, showing radial cortical 



oxeas arching over sub-dermal sj)aces ( x 12). 

 Fk;. 1(i. — Crnniella xn/jitift var. mkrofiu/ma, vertical section of corti'X in oscular region showing absence of 



radial cortical oxeas (x 12). 

 Fig. 17. — Graniella saffitta \ax. pachyrrliabdu>i, flagellated chambers (x 200). 

 Figs, is, ]'.).— Collar cells of the same (x 1000). 



Note. — The flagellated chambers as seen in fig. 17 are nearly denuded of collar cells, which 

 have probably become separated owing to the action of the osmic acid used in the case of this 

 specimen ; consequently the collar cells with their collars, as seen in the figures, have probably not 

 become fixed in their normal position. See remarks on ]>. I. 



