PLATE XXII. 



FIG. 1. Mt/j'il!n iJeeeptft Kirkp. on branch of Polyzoon, nut. size, p. 27. 



Fin. 2. The same encrusting a stone, nat. size. 



Fin. :.'</. -Surface of Fig. 2, enlarged. 



Fin. 3.- Hynwi'xiiiiit iim>l/it<i Thiele, |- nat. size, p. 24. 



FIG. .W.- Osciile of same (x 2) ; Fig. ?,b, pore area (x 5) ; :V. vertical section ( x .">). 



FIG. -t. Hi/mf</i-xiiti'i I'.rit/na Kii'kp., nat. size, p. 24. 



Fif*. .">. Hymfrrii/ijihn/ rnfn Kirkp., nat. size, p. 25. 



Fn:. 0. Ophlitaspongia itnlijimia Kirkp., nat. size, p. 2."i. 



FIG. 6. Section of half of echinated fibre (x 20). 



Fn.. 7.- -Lissom ij.iilln Ininitxi'hi Kirkp., nat. size. p. 26. 



Fin. la. -Vertical section of same ( X - 11 ). 



Fin. x.--A.ri/}i-IIi< sii/irti/itii/rxiriiK Topsent, nat. size, p. 2:1. 



Fin. s. - Longitudinal vertical section of same (x 2(i). 



