PLATE XVI. 



Fifi. ]. Joi/euxia belli KivkTp., mit. she, Y). il. 



Fig. 2. Section of simie tlironijh a por.il tube, oortex ;uk1 choaunsome (x 10). 



Fig. 3. End of a larger poral tube, showing poi'al sieve ( x 10). 



Fig. 4. Style (rare) (x 100). 



Fig. 5. Strougyle(x 100); .5a, further enlarged . 



Fig. ('t.--Sf.yloiordylii. boiealix Loven var. umuita var. u., nat. size, p. '22. 



Fig. 7. Ectosomal micro-styles ( x 100); 7ii(x 500). 



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



Fig. !t. Heteroxea (x 100). 



Fig. 10. — Large oxea of stem, with central swelling (x 100). 



Figs. 11, 11a. — Suleritex mmiiiatus 11. & D. \-av. papilldttm u. var., nat. size, p. 20. 



Fig. 1 2.— Cortical tyle ( X 100). 



Fig. 13.- Ditto (x 100). 



Fig. 11. -Tyle from radiating skeletal fibre (x 100). 



