Plate XXIV. 



All the figures on this Plate are after Prof. Alhnan. 



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



2. Statoblast of C. mucedo. 



3. 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. 



