REVISED LIST OF MARINE ALGM. 141 



92. Fronds narrow, much divided, ultimate ramuli 



pectinate Plocamium 



Fronds palmately or dichotomously divided ... 93 

 Fronds undivided, dull red, tetraspores and 



cystocarps immersed Dilsea 



93. Fronds very thin and delicate ... ... ... 94 



Fronds thickish, sub-cartilaginous or sub- 



membranaceous ... ... ... ... ... 95 



94. Fronds rose-red or purplish, margins entire, 



usually more or less veined, tetraspores cruciate 



in scattered spots (sori) Nitophyllum 



Fronds dark red, ciliate, tetraspores zonate 



Bhodophyllis 



95. Tetraspores cruciate ... ... ... ... 96 



Tetraspores zonate Calliblepharis 



96. Fronds deep red broadly palmate or dichotom- 



ous, sometimes repeatedly laciniate with 

 narrow segments, margin proliferous Bhodymeiiia 

 Fronds bright red, broadly palmate or dichotom- 

 ously divided, spores immersed in minute 

 marginal cilia Callophyllis 



Explanation of Plates. 

 Plate II. 



Fig. 1. Two fronds of Gatenella opuntia, shewing root- 

 branch, and cystocarps, terminal and lateral. 

 X 10. 



Fig. 2. Trichophoric apparatus with one trichophoric cell, 

 arising from cortical filament. X 450. 



Fig. 3. Trichophoric apparatus with two trichophoric 

 cells. X 450. 



Fig. 4. Terminal cell of the axial row from which arise the 

 filaments which bear the carpospores. X 450. 



