520 Transactions. 
springs a solid trunk, which presently expands into a large flabellate thallus 
with many various-sized segments. ese sweep about in the waves, and 
are usually broken off at the ends. Durvillea fronds are fairly buoyant, as 
the bulk of the tissue is made up of long polygonal cells stretching across 
the lamina and terminating in tough cortical tissue of small cells. Th 
frequently support large colonies of the epiphyte Porphyra subtumens. The 
e Cystophora grows fairly closely, and reaches a length of 30 em. to | 
50cm. It bears along its entire length an abundance of epiphytes, consist- 
ing chiefly of large clusters of Corallina. Other epiphytes are various red 
algae. As usual in the large-brown-algae formation, Xiphophora chondro- 
phylla is most abundant along the upper. edge. Occurring with it are 
Chaetomorpha Darwinii and other algae, chiefly red kinds. 
The undergrowth of this association consists mainly of red algae, of | 
chiton neglectus, Plaxiphora egregia, Margarella antipoda, Cantharidus oliveri, af 
Siphonaria australis, and Cantharidella nitida—which eat hollows for 
selves. The foot in the case of Onithochiton, Plaxiphora, and Siphonaria Ls 
1s protruded into the concavity well outside the limits of the shell. ‘With 
the molluscs mentioned are associated numbers of Sphaeroma, brown 8007 
anemones, Nereis magalhaensis, Lumbriconereis sphaerocephala, and Spirorbis Sens 
on the shells of Siphonaria and Margarella. 
On the rock-surface under the Durvillea base a slightly different set of 
Sypharo- 
animals is found. The following are commonl t with here: 
: x es; T A y met wi ere ue 
chiton sinclairi, Euthria linea, Petrolisthes elongatus, Halicarcinus planatus, 
Thoristella oppressus, Haliotis australis, sponges, tunicates, shrimps, WO 
Al ee 
