390 
PACIFIC SCIENCE, Vol. VIII, October, 1954 
LOCAL DISTRIBUTION: On rocks, Sta. 4 
( 11160 ). 
Like the material reported by Tseng (1936^) 
from Hainan, and that illustrated by Okamura 
(1908), these specimens are rather small, 
mostly under 2 cm. in diameter. Summer ex- 
amples have not been seen. The hollow char- 
acter distinguishes the species from Dictyo- 
sphaeria versluysii, which is similar in gross 
appearance, but solid. 
Cladophoropsis membranacea (Ag.) B^r- 
gesen 1905: 275; Bprgesen 1913, p. 42, 
figs. 26-33. Conferva membranacea C. Agardh 
1824: 120 (Virgin Islands) 
Fig. 8/ 
LOCAL DISTRIBUTION: Sparse, as small loose 
tufts on coral dredged from 2-3 m., Sta. 2 
(11367). The filaments of these average about 
225 M in diameter. 
Cladophoropsis herpestica (Mont.) Howe 
1914: 31; Setchell 1926: 77, pi. 8, fig. 1. 
Conferva herpesticals/lo\i\i 2 ignQ 1842: 15 (New 
Zealand) 
LOCAL DISTRIBUTION: Forming a loose 
clump, 2-3 cm. in extent, of coarse, + — 
decumbent filaments, on rocks, Sta. 4 (11197). 
These specimens are young and mostly un- 
branched, but in habit, in diameter (400-500 
}i), and in their thick (35-50 ju), stratified walls 
they are in agreement with Howe’s comments 
on Montagne’s type, as well as with other 
New Zealand specimens. 
Struvea anastomosans (Harv.) Piccone and 
Grunow, ex Piccone 1884^: 20; Egerod 
1952: 359, pk 31, fig. 4a-h. Cladophora 7 
anastomosans Harvey 1859^, ph 101 (Fre- 
mantle, West Australia) 
Fig. 8g 
LOCAL DISTRIBUTION: Occasional on coral 
heads dredged from 2-3 m., Sta. 2 (11371). 
Boodlea composita (Harv.) Brand 1904: 
187; Bprgesen 1940: 21, fig. 6. Cladophora 
composita Harvey 1834: 157 (Mauritius) 
Fig. 9c, d 
LOCAL DISTRIBUTION: Forming irregular, 
bright green, spongy mats on coral rocks at 
and below low tide level, Sta. 1 (11119). 
Some plants show StruveaAik.^ characters in 
the regular branching of their outermost parts, 
as in 11313 from Sta. 9. 
Anadyomene wrightii Gray 1866: 48, pi. 
44, fig. 5 (Ryukyu Archipelago); Okamura 
1908, leones I, pi. 40, figs. 1-6 
Fig. 9c 
LOCAL distribution: Occasional, Sta. 3 
(11206); common on exposed rocks beyond 
the Sargassum area, Sta. 10 (11335). These 
specimens are identical with material collected 
by the writer on Okinawa in the Ryukyu 
Islands. 
Derbesta attenuata sp. nov. 
Fig. 9a, b 
Thallis epiphyticis plerumque solitariis, 
2. 5-4. 5 mm. aids, e parte basali lobata, pro- 
strata, ramata, 1-2 axes dichotomus, erectos, 
arborescentes emittente; axibus erectis baud 
ramatis infra, sine constrictionibus, 40-50 n- 
diametro, regulariter dichotomis supra inter- 
vallis 200-300 ii, attenuatis gradatim ad 10-12 
diametro; chromatophoriis rotundis, circiter 
3 M diametro. 
Thalli minute, epiphytic, usually solitary, 
2. 5-4.5 mm. high, consisting of a prostrate, 
branched, and lobed, adherent basal part 
about 30 ij, in diameter and extending 200-300 
fjL, this giving rise to one or sometimes two 
erect, arborescent, dichotomously branched 
axes; erect axes unbranched in their lower 
800-1,500 IX, smooth, without constrictions, 
40-50 in diameter, then regularly dicho- 
tomously branched with rather narrow angles 
at intervals of 200-300 /x and becoming gradu- 
ally attenuated to 10-12 ix in diameter in the 
