Laguna Watrine Laboratorp 195 
NOTES ON THE MARINE ALG OF 
LAGUNA BEACH 
JOHN GUERNSEY 
It was my intention during the first summer at Laguna Beach to 
make some beginning in anatomical and ecological studies of a few 
of the very numerous and interesting marine Alge occurring there. 
In the course of this work, large collections accumulated. <A set of 
specimens was submitted to Dr. W. A. Setchell and he has very 
kindly given the determinations of them, calling especial attention 
to the fact that many of the names applied to our west coast Alge 
are as yet uncertain in their application, and that the nomenclature 
is in need of careful revision, as some of the species themselves are 
in need, quite as urgently, of more detailed anatomical studies. I 
Figure 105. Calothrix parasitica (Chauyv.) Thuret 
have no desire to present this as a ‘‘mere list,’’ since it means much 
more to me. It ineludes, however, a list of the commoner forms that 
any student will encounter at Laguna, and mostly in great abundance. 
We want to begin to know these things in their distribution and eco- 
logical relations, and this seems the logical and necessary first step. 
CYANOPHYCEAE 
Brachytrichia quoyi (Ag.) Bornet and Flahault 
One small colony of this species was taken on the holdfast of a 
Nereocystis coming from about four fathoms. Dr. Setchell says this 
