PLATE XVI. 



Fro. 1. — Joyeuxia belli Kirkp., nat. size, p. II. 



¥iCr. 2. — Section of same throngh a poral tnbc, (cortex and cijoanosome ( X 10). 



FiOr. 3. — End of a larger poral tube, .showing poral sieve ( X 10). 



Fm. 4.— Style (rare) (X 100). 



Fig. 5. — Strongyle (x 100) ; (»a, further enlarged. 



Tia. fi. — Stylocordyla borealix Tvovcn var. acnata var. n., nat. size, p. "22. 



Fi&. 7. — Ectosomal micro-styles ( X 100); 7a (x 500). 



Fig. 8.— Smaller oxea of the bead of the sponge (x 100). 



Fig. 9.— Heteroxea ( X 100). 



Fig. 10.— Lttrge oxea of stem, with central 8\vclling (x 100). 



Figs. 11, 11a. — Suhwites camhuitus K. & D. vw:. pajjillatus n. var., nat. size, p. 20. 



Fig.. 12.— Cortical tyle (X 100). 



Fig. 13.— Ditto ( x 100). 



Fig. 14.— Tyle from radiating skeletal fibre (x 100). 



