PLATE XXVI. 
Figs. 1, la. — Sertularia implexa (p. 54). 
Fig. 1. — Portion of a colony ; natural size. 
Fig. la. — Portion of the same; magnified 15 diameters. 
\ 
Figs. 2, 2a. — Sertularia laxa 1 [exigua] (p. 55). 
Fig. 2. — A colony ; natural size. 
Fig. 2a. — Portion of a colony; magnified 15 diameters. 
Figs. 3, 3a. — Sertularia polyzonias { p. 55). 
Fig. 3. — A colony ; natural size. 
Fig. 3 a. — Portion of a colony; magnified 15 diameters. 
1 It has been found necessary to change the name since the Plate was printed off. 
