PHAZOPHYCEZ 87 
rochnus being usually club-shaped or cylindrical, with 
a terminal tuft of filaments. 
The Geographical Distribution of the Sporochnacee: 
is mainly confined to the coasts of Australia and the 
southern ocean. The most of the species of Sporochnus, 
which like Bellotia are among the most beautiful 
of olive-brown Algz, are Australian; Bellotia, Encyo- 
thalia, and Perithalia inhabit the same _ region. 
Sporochnus, Nereia, and Carpomitra enter the warm 
Atlantic, and one species of Sporochnus (S. pedun- 
culatus) and Carpomitra Cabrerw occur in British 
seas. 
Two puzzling types, viz. Spermatochnus and Stilo- 
phora (with Halorhizaz) may be conveniently dealt 
with here as supplementary to the Sporechnacew. 
Their diversity-consists in their vegetative structure 
and development, which appear to be intermediate 
between this order and Chordariaccw, as are also 
their reproductive characters. The difficulty of 
placing them has been solved by making separate 
orders, viz. Spermatochnacee and Stilophoracee, for 
their reception, but considering how much remains 
to be discovered in the neighbouring groups, it 
appears to be scarcely justifiable to add, on grounds 
mainly of vegetative development, to the already 
excessive number of orders in the Phwophycee. 
Spermatochnus, which occurs in British seas and on 
the Scandinavian shores of the North Sea, has been 
minutely studied by Reinke. Jt has a filiform 
thallus, consisting of primarily a single central row 
of cells, surrounded by a mantle of parenchymatous 
cells. It grows by the division of an apical cell, and 
