PLATE XLIX 



Fig. I. Halidona bilamellata,sp.n. A tubular specimen, x f . 



Fig. 2. Halidona bilamellata, sp.n. A flabellate specimen showing 



oscular surface, x J. 

 Fig. 3. Halidona bilamellata, sp.n. The same, showing poral surface. 



X 



A 3. 



Fig. 4. Callyspongtaflabellata, sp.n. Holotype. x f . 



