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PACIFIC SCIENCE, Vol. XI, January, 1957 
Fig. 21. Gelidiella bornetii : Habit of part of a plant 
of D. 14035, X 9. 
Lomentaria hakodatensis Yendo; Dawson 1956: 
52, fig. 50 
D. 13709, 13853, 13928, 13999i, 14025. 
Champia parvula (C. Agardh) Harvey; Daw- 
son 1954: 443, fig. 52c; Dawson 1956: 51 
D. 13746, 13849, 14015a. 
Champia vieilardii Kiitzing ?; Dawson 1954: 
443, figs. 52e, 53; Dawson 1956: 51 
D. 139991. A small fragment only of un- 
certain identity. 
Rhodymenia anastomosans Weber van Bosse; 
Dawson 1956: 52, fig. 49 
D. 13900. 
Antithamnion Iherminieri (Crouan and Crouan) 
Nasr; Dawson 1956: 53, fig. 51 
D. 13609a, creeping among other minute 
algae; 13696b, 13950b, epiphytic on Hali- 
meda and Caulerpa; 13999b, epiphytic on 
Halimeda. 
Antithamnion percurrens sp. nov. 
Fig. 24^, h 
Thalli minute, densely tufted, 5-6 mm. 
high, uniseriate throughout; creeping, pros- 
trate filaments of lower parts fastened to the 
calcareous substrate by short lateral branch- 
lets modified for attachment; main axes both 
prostrate and erect about 15-18 /x in diameter, 
of cells mostly 2-3 diameters long; erect 
axes strongly percurrent, without indeter- 
minate branches; determinate lateral branch- 
lets regularly distichous from every axial cell, 
60-120 /x long, symmetrically curved upward, 
commonly bearing 1-3 short, 1-2 celled 
secondary determinate branchlets on the 
adaxial side; all branch tips blunt; tetraspor- 
angia about 20 /x in diameter, tripartite, sparse, 
sessile, borne within a large, prominent, gela- 
tinous envelope from the adaxial side of the 
basalmcst cell of a lateral branchlet, usually 
causing a local disarrangement of the pinnae 
because of the size of the envelope. 
Thallis 5-6 mm. aids in omnis partibus 
uniseriatis, axilibus principalibus valde per- 
currentibus 15-18 /x diametro cellulis ple- 
rumque 2-3-plo longioribus quam latis, 
Fig. 22. a, Dicranema rosaliae : Habit of a dry plant 
of D. 13980, X 1.7. b, Dasya iyengarii : Habit of part of 
a dried tuft of a somewhat robust form, X 2.0. 
