PLATE XXX. 
Figs. 1, la. — Sertularia operculata (p. 61). 
Fig. 1.— Portion of a colony ; natural size. 
Fig. la. — Portion of same ; magnified 20 diameters. 
Figs. 2, 2a, 2b, 2c. — Diphasia pinaster (p. 63). 
Fig. 2. — A male colony ; natural size. 
Fig. 2a. — Part of a female colony with its gonangium ; magnified about 20 diameters. 
Fig. 2b. — Part of a male colony with its gonangium ; magnified about 20 diameters. 
Fig. 2c. — Part of a female colony ; natural size. 
