PLATE X. 
Figs. 1 , la, lb. — Campanularia tulipifera (p. 20). 
Fig. 1.— A colony ; natural size. 
Fig. la. — The same ; magnified 5 diameters. 
Fig. lb . — A hydrotheca, still further magnified. 
Figs. 2, 2 a. — Campanularia ptychocyathus (p. 20). 
Fig. 2. — A colony ; natural size. 
Fig. 2a.' — Portion of a colony; magnified 10 diameters. 
Figs. 3, 3a . — Calamphora parvula (p. 29). 
Fig. 3. — A colony ; natural size. 
Fig. 3a. — Portion of a colony ; magnified 25 diameters. The large gonangium 
springing from the creeping stolon close to the base of a hydrotheca. 
