PLATE XXXVI. 



I- 10. 



1. Smittia Landsborovii, p. 34T ; 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 outliue of the 



adult orifice. 



9, 10. ScnizopoRELLA Albert, p. 243. 



