Plate XXTI. 



All these figures, except 4 and S, are enlarged. 



1. Mucronella coccinea, p. 286. 



2. Mucronella variolosa, p. 285. 



3. Lepralia foliaceaj p, 278. 



4. Retepora Beaniana; nat. size, p. 289. 



5. Crisia cornuta, p. 294. 



6. Crisia eburnia, p. 294. 



7. Idmonea serpens, p. 301. 



8. Lichenopora hispida, nat. size. 8a, Zoarium en- 



larged, p. 305. 



I 



i 



