PLATE XI. 



FIG. 



1. SERTULARIA ROSACEA, p. 64, of the natural size, from a 



beautiful, and unusually large, specimen in the col- 

 lection of Dr. Coldstream of Leith. 



2. A portion of SERTULARIA FALLAX, p. 73, magnified. 



3. SERTULARIA PUMILA, p. 66, of the natural size. 



4. A portion of the same magnified. 



5. SERTULARIA FALLAX, p. 73, of the natural size. 



6. A portion of the same magnified. 



