238 SEAWEEDS 
Plumaria,*  Ballia,  Antithamnion,* Crouania,* 
Spyridia,* Carpoblepharis, Ceramium,* Microcladia,* 
Rhodochorion,* and Thamnocarpus, those with an 
asterisk occurring in British seas. The family is of 
universal distribution in the sea, especially the 
genera Callithamnion and Ceramium. 
CRYPTONEMIACE. 
General Characters. — As in the Gelidicw, the 
fertilised carpogonium emits a relatively long 
ooblastema filament, which branches copiously in 
the thallus tissue. Its terminal 
cells or joint-cells conjugate each 
with single auxiliary cells, and 
from these the gonimoblasts 
spring. In Gelidiew the fila- 
ment which emerges from the 
carpogonium is itself the goni- 
moblast, and its conjugations 
with thallus cells appear to be of 
nutritive importance only, while 
in the Cryptonemiacee: the fused 
cells give nse to the gonimoblast. 
Glovosiphonica, Grateloupice, 
Dumonticw, and Nemastomee. 
Fic. 8). — Young procarp eae e 
of Gloiosiphonia capillaris. These four families, Figs. 79, 
ier 80, 81, are all characterised by 
the auxiliary cells being joint cells of secondary or 
primary filaments, and the carpogonial filaments 
usually of similar origin. The ooblastema filament 
