Yendo : CORALLINAE VER. 713 
between the tidal marks as well as in the pools. Amphiroa 
tuberculosa and Amp. cretacea f. tasmanica are found at the 
depth of 2-5 ft. below the low-water mark or the surface of the 
pools: the former species assumes very diverse forms when it 
is found at the margins of the pools, or between tidal marks. 
So also do Corallina officinalis var. chilensis, and Chetlosporum 
MacMillanz; but the latter two are not infrequently found in 
more shallow water. Cor. vancouvertensis and its variety, on 
the contrary, are in most cases found at the margins of the 
pools, and in the region a little above the low-tide mark. They 
are also found epiphytic on the shells of Mya which cover the 
enormous area of the drained beds, thus making it easy to col- 
lect the entire bunch of the plants. Chel. frondescens is also 
found in similar positions. Chezl. plantusculum is also an in- 
habitant of the pools, but slightly below the margins. When 
it grew above the water mark the frond is mostly stunted, appar- 
ently forming a granular mass. In the tide pools high above 
the water-level Cor. aculeata is generally found; water in such 
pools is mostly brackish, at least during the ebb tide hours ; and 
the plant seemed to be able to adapt itself to it. This might be 
the probable cause why the ultimate articuli of the branches of 
this species are insufficiently calcified. Nevertheless, Cor. van- 
couveriensis, Cherl. californicum, Cheil. planiusculum, etc., may 
also be found in these brackish pools without any apparent modi- 
fication in the characters of their fronds. Briefly speaking, Cor. 
vancouvertensts is an inhabitant of the shallowest water, and 
Amp. tuberculosa, as it were, of the deepest. The latter view 
may be corroborated by the fact that we often find the frag- 
ments of Amp. tuberculosa growing attached to the holdfast of 
NVereocystis Liitkeana hauled up out of water 20-50 feet deep. 
Cor. pilulifera and its varieties which are abundantly found 
in Kamtchatka and in the northern part of Japan could not be 
found at Port Renfrew. Their places seem to be taken by 
Cor. vancouveriensis and Chel. planiusculum. The habitat 
of these is much like that of the typical form of Cor. oficinalis 
or Cor. squamata. 
Cheil. frondescens which was described by Ruprecht* col- 
lected in Unalaska is common at this coast. Areschoug + re- 
* Post. et Rupr.: Illustr. alg., p. 20. 
f Aresch.: in J. Ag. Spec. alg., IL, p. 549. 
