374 
PACIFIC SCIENCE, VoL VIII, October, 1954 
had in mind in each instance, my field collec- 
tion numbers are cited with each species. 
These numbers will identify the specimens 
of which the first four sets have been dis- 
tributed as follows: set 1, U. S. National 
Herbarium, Washington; set 2, Bishop Mu- 
seum, Honolulu; set 3, Allan Hancock Foun- 
dation, Los Angeles; set 4, Institut Oceano- 
graphique de Nha Trang. The dates of 
collection indicated by these numbers are as 
follows: 11065-11217, January 23-February 
1, 1953; 11218-11422, February 2-28, 1953; 
11423-11454, March 1-18, 1953. 
ACKNOWLEDGMENTS 
I am grateful to Mr. H. J. Coolidge of the 
Pacific Science Board for making the arrange- 
ments for my visit to Nha Trang, to Captain 
Allan Hancock for permitting me leave of my 
regular duties at the Hancock Foundation, to 
Mr. Raoul Serene for kindness and helpful- 
ness in providing for my physical comfort and 
for the use of the facilities at the Institut 
Oceanographique de Nha Trang, and to Dr. 
Maxwell Doty for much help and for provid- 
ing the facilities of his laboratory at the Uni- 
versity of Hawaii. 
Messrs. Trinh van Nam and Phan-Hay of 
the Institut Oceanographique assisted me by 
making a number of the habit illustrations 
presented here. 
I am indebted to several specialists for 
making identifications of plants: to Dr. Ha- 
rold St. John for identifying the marine phan- 
erogams, to Dr. Francis Drouet for identifying 
the Myxophyta, to Dr. Yukio Yamada for 
identifications of Sargassum and Liagora, and 
to Dr. Paul Silva for identifying Codium. 
Dr. Robert B. Cross kindly prepared the 
Latin for the diagnoses of new species. 
COLLECTING LOCALITIES 
The seaweed collector at Nha Trang finds 
the varied marine plants of the region singu- 
larly accessible to him. A large proportion of 
the species are of intertidal occurrence, and 
one needs only to choose the times of es- 
pecially low water to find them conveniently 
exposed or visible to a wader. The quite 
numerous small species inhabiting the living 
and dead coral masses of the lagoons are best 
obtained by grappling for suitable pieces of 
coral which may then be searched carefully 
for these specimens in good light. Only a few 
species occur which may not be obtained in 
one of these ways. The larger of these remain- 
ing infratidal species, such as Halymenia and 
Titanophora which are of infrequent occurs 
rence, may be located by the use of a water 
glass and brought up by diver. At depth- 
greater than about 4 meters, the algae are 
virtually absent from the biota, which con- 
sists of a seemingly infinite diversity of 
animal forms. Only an occasional macroscop- 
ic alga, such as Galaxaura vietnamensis, has 
been taken from Nha Trang Bay in depths of 
10-30 meters. Accordingly, the following 
brief account is concerned mainly with the 
more fruitful intertidal habitats in the vicinity 
of the Institut Oceanographique. 
Cau Da 
The shore within 300 meters to the north 
and south of the Institut yields an interesting 
diversity of algae, particularly calcified forms 
associated with living and dead coral. At low 
tide the cove to the north of the laboratory is 
the best locality for collecting Liagora, Gal- 
axatira, Ceratodictyon, Neomerls, Turbmarla, 
Boodlea, Dictyosphaeria, and Amphiroa foliacea. 
Mesospora is abundant on the smooth rocks 
at high-water level. The shallow lagoon im- 
mediately adjoining the Institut and north of 
the wharf is rich in Padina, Colpomenia, Hydro- 
clathrus, Gracilaria crassa, Hypnea, Liagora, etc. 
Depths of 1 or 2 meters here are best for 
ohtdimvLgllalymenia, Titanophora, Codium, and 
Caulerpa serrulata. The shore to the south of 
the village of Cau Da is not particularly pro- 
ductive of different species, although Ana- 
dyomene may be found in small quantity. The 
only Ulva association observed by the writer 
is on rocks adjoining the village of Truong 
Tay. 
