Plate 9. 



Thuiaria tubuliformis, page 14. 

 The figures are from camera drawings finished by J. H. Emerton. 

 Fig. 1. A colony, natural size. 

 Fig. 2. Part of a colony. > 60. 



Fig. 3. A hydrotheea showing successive additions, x llfi. 

 Figs. 4 ainl .">. Gonothecae. x 60. 



