PLATE V. 
Figs. 1, la . — Halecium telescopicum (p. 10). 
Fig. 1. — Portion of a colony ; natural size. 
Fig. la . — Portion of the same colony; magnified 15 diameters. 
Figs. 2, 2a . — Halecium flexile (p. 11). 
Fig. 2. — An entire colony ; natural size. 
Fig. 2a. — A portion; magnified 15 diameters. 
