PLATE XXXVI. 



FIG. 



1. SMITTIA LANDSBOROVII, p. 34*1 ; var. (PORIFERA). 



2. , var. (CRYSTALLINA) . 



3-5. SMITTIA MARMOREA, p. 350. 



6. PORELLA MINUTA, p. 326 ; littoral form. 



7. Young cell of PORELLA CONCINNA, showing the pri- 



mary orifice. 



8. Young cell of PORELLA MINUTA, with outline of the 



adult orifice. 



9, 10. SCHIZOPORELLA ALDERT, p. 243. 



