PLATE XXXVI. 
Figs. 1, la . — Staurotheca dichotoma (p. 76). 
Fig. 1.— A colony ; natural size. 
Fig. la. — Part of a colony; magnified 10 diameters. The extremity of a neighbouring- 
branch is seen with its tendril-like continuation, which has become attached 
by its extremity to the hydrocaulus near the base of a hydrotheca. 
Figs. 2, 2a . — Dictyocladium dichotomum (p. 77). 
Fig. 2. — A colony ; natural size. 
Fig. 2a. — Part of a colony; magnified 15 diameters. The tendril-like continuation of 
one of the branches is seen to have attached itself by its extremity to the 
orifice of a hydrotheca on a neighbouring branch. 
