PLATE LXXIII. 



Oristatella mucedo, p. 387. 



(Copied from Turpin in Annales des Sciences Naturelles, 

 Seconde Serie., Tome vii. pi. 2 and 3.) 



FIG. 



1 . The polype at the period of its birth, magnified. 



2. The same when fully developed. 



3. The tentacular filaments very highly magnified to show 



their cilia. 





