392 BULLETIN OF THE BUREAU OF FISHERIES. 
During the winter of 1908-9 monthly collections of all species observed were made 
for the author from the time of his departure from the laboratory, October 20, 1908, 
until his return, June 30, 1909. While more careful studies would probably alter the 
present data in some details, these collections and those made by the author in May, 
1907, and April, 1908, give a fair picture of the seasonal distribution of the alge in the 
harbor. 
The species occurring there in the summer may be grouped as follows: 
DOMINANT SPECIES. Erythrocladia recondita. 
; Erythrotrichia carnea. 
Lyngbya confervoides. Goniotrichum alsidii. 
Codium decorticatum. 
$ Acrochetium dufourii. 
Codium tomentosum. etek nether 
Sargassum filipendula. Acrochetium virgatulum. 
Boas CSE Gelidium coerulescens. 
seer ie te Gelidium crinale. 
ap ees, Sigua apa Gymnogongrus griffithsiz. 
SOE pon mite tee Actinococcus aggregatus. 
a eats ae Hm Agardhiella tenera. 
wreepa ie S Eucheuma gelidium. 
Dermatolithon pustulatum. Chatapia waryila 
OCCURRENCE MORE LIMITED. Lomentaria uncinata. 
Chondria sedifolia. 
Ulva lactuca. Herposiphonia tenella. 
Ulva fasciata. Polysiphonia harveyi. 
Ectocarpus mitchelle. Polysiphonia denudata. 
Rosenvingea orientalis. Ceramium tenuissimum. 
Fucus vesiculosus. 
The other species of the summer flora mentioned in Table 1 have been found only 
occasionally. 
By the middle of October changes in the flora have become evident. Dictyota has 
become relatively scarce, and Padina is less abundant than formerly, the plants of both 
species being small and showing signs of degeneration; Chondria dasyphylla has almost 
disappeared; Hypnea is still abundant and shows little change except that there seems 
to be a greater preponderance of tetrasporic plants than formerly; Codium and Gra- 
cilavia confervoides are still present; Ectocarpus is abundant and conspicuous; large 
plants of Fucus are abundant and the fruits are well developed. 
During November this change continues. Dictyota becomes still scarcer and 
finally disappears; Hypnea is reduced to small sterile plants, the condition in which it 
passes the winter (PI. CI, fig. 2); and the first of the spring flora, Petalonia fascia, makes 
its appearance. 
In December we find the last plants of Padina and the species growing on this, 
Erythrotrichia and Goniotrichum; Gracilaria confervoides has disappeared; Codiwm 
tomentosum, Champia, and Chondria sedifolia are still present; Enteromorpha prolifera, 
Agardhiella, and Gracilaria multipartita are more conspicuous; Petalonia grows to a 
large size; while occasional plants of Grinnellia and Dasya are found. 
By January Champia and Chondria sedifolia have disappeared; Ectocarpus conjer- 
voides has replaced the summer species, E. mitchelle; Grinnellia has become conspicuous, 
and small plants of Porphyra have appeared. 
