XVI DESCRIPTION OF PLATES. 



3. Lepralia foliacea, p. 278. 



4. Retepora Beauiana, nat. size, p. 289. 



5. Crisia cornuta, p. 294, 



6. Crisia eburnia, p. 294. 



Plate XXIII. 



1. Alcyoiiidium parasiticum, nat. size, p. 310. 



2. Flustrella hispida, enlarged^ p. 311. 



3. Yesicularia spinosa^ nat. size. 3a, Enlarged, p. 313. 



4. Amathia leudigera, nat. size. 4a, Enlarged, p. 314. 



5. Bowerbankia imbricata, nat. size, p. 315. 



6. Mimosella gracilis, nat. size, p. 323. 



7. Pedicellina cei-nua, enlarged, p. 326. 



Plate XXIV. 

 All ihe figures on this Plate are after Prof. Allman. 



1. Cristatella mucedo, nat. size, p. 328. 



2. SStatoblast of 0. mucedo. 



o. Plumatella repens, nat. size. 3a, Polypide enlarged, 

 p. 331. 



4. Fredericella sultana, nat. size. 4a, Polypide en- 



larged, p. 333. 



5. Paludicolla Ehrenbergii, nat. size, p. 324. 



6. Lophophore of P. Ehrenbergii. 



