147 
PLATE XVIII. 
Figs. 69, 70. Plants shewing intergrade condition between Callithammion 
Big. 71. 
eS “92. 
Bigs 73. 
Bigay 7A. 
Big. 75. 
Bis.) 76. 
Big 77: 
Bis. 78. 
Big 70: 
Fig. 80. 
Ky 
Hooken and C. polyspermum. X 2. 
Young plants of Nitophyllum uncinatum. Nat. size. 
Part of a plant of Pleonospovium Borreri. x 2. 
Part of a plant of Calhihamnion corymbosum. xX 2. 
A young plant of Callithamnion brachiatum. x 2. 
PLATE XIX. 
Evythropeltis discigera on Flustra. x 280. 
Cell-organisation of Evythropellts discigeva. X 900. 
Part of a filament of Rhizoclonium Kerneri. X 240. 
Streblonema infestians. X 360. 
Ectocarpus brevis. xX 480. 
Ectocarpus fasciculatus var. Draparnaldioides.  X 240. 
