124 
PACIFIC SCIENCE, Vol. XI, January, 1957 
habit more like that of Dasyopsis palmatifida 
W. v B. from the same localities, and suggest 
further that it is only a variant of D. geppii. 
Heterosiphonia wurdemannii var. laxa B0rgesen; 
Dawson 1956: 57, fig. 60; Taylor 1950: 
140 (as H. wurdemanni) 
D. 13609, 13698, 13739, 13750, 13781, 
13760, 13895, 13999- A common small spe- 
cies growing under a variety of conditions 
and showing variable habit but mostly tend- 
ing toward B^rgesen’s var. laxa. 
Polysiphonia coacta Tseng, prox.; Dawson 
1954: 456, fig. 60g, h; Dawson 1956:57 
D. 13857d, 13922. 
Polysiphonia subtillissima Montagne; Dawson 
1954: 454, fig.* 60c; Dawson 1956: 58 
D. 13904. 
Polysiphonia tongatensis Harvey; Dawson 1954: 
454, fig. 60d, e; Dawson 1956: 57 
D. 13644, 13906, 13933, 13925, 13950c. 
Tolypiocladia calodictyon (Harvey) Silva; Daw- 
son 1956: 58, fig. 62; Taylor 1950: 148, pi. 
57, fig. 2 (as Rochera calodictyon ) 
D. 13625, 13705, 13881, 13834, 13899, 
13957. P. 18129, Runo Is. lagoon at 60 ft., 
3/8/55; P. 2500, l A mi. off Engebi Is. in 
lagoon at 15 ft., 3/2/55; P. 2816, s.e. end of 
Bokanjoio Is. in lagoon at 60 ft., 3/8/55; 
P. 22x, Runit Is. n.w. tip on channel, 10/22/ 
52; P. 60, off n. tip of Igurin Is. in lagoon at 
20 ft., 10/28/52; P. 1153, Engebi Is. lagoon, 
4/11/54. 
Herposiphonia secunda (C. Agardh) Ambronn; 
Dawson 1956: 58, fig. 63; Taylor 1950: 148 
D. 14002a, growing on the membrane of 
Valonia ventricosa. 
Herposiphonia tenella (C. Agardh) Ambronn; 
Dawson 1954: 452, fig. 59a; Taylor 1950: 
147; Dawson 1956: 59 
D. 13771a, 13904a, 13914, 14017. 
Lophosiphonia hermudensis Collins and Hervey; 
Dawson 1956: 59, fig. 65 
D. 13696, 13903a, 13999a, 14035b. My 
attention has been called to the fact that 
Howe (1918: 521) has reduced this species 
under Dipterosiphonia rigens (Schousb.) Fal- 
kenb. It appears that a more critical review 
is called for than can be attempted here. 
Lophosiphonia obscura (C. Agardh) Falkenberg; 
Dawson 1954: 451, fig. 58d, e 
D. 13648, 13867. The latter is virtually 
identical with B^rgesen’s 1918 figure of tetra- 
sporic material. 
Laurencia mariannensis Yamada; Dawson 
1956: 60, fig. 66; Taylor 1950: 144, pi. 55, 
fig. i 
D. 13747. P. 2587a, Aitsu Is., 2/11/55; P. 
2832, Igurin Is. lagoon at 50 ft., 3/16/55. 
Laurencia nana Howe 1920: 566 (Mariguana, 
Bahamas) 
Fig. 30^ 
D. 13725. These fertile specimens are in 
excellent agreement with Howe’s description, 
including the palisade cortical cells, the pres- 
ence of rhizoidal haptera and the lack of 
lenticular thickenings. 
Laurencia parvipapillata Tseng; Dawson 1954: 
458, fig. 6lg 
D. 13754, 13964. P. 2833, Igurin Is. lagoon 
at 50 ft., 3/16/55. 
Chondria minutula Weber van Bosse 1923: 
349, pi. 10, figs. 10, 12 (Tanah Djampea 
Is., Indonesia) 
Fig. 30 d, e 
D. 13744, 13771, 13932a, 13788a. The 
tetrasporic and cystocarpic material seems to 
agree well with Weber van Bosse’s account 
of the type which had a similar creeping habit 
and the same stature. 
Chondria polyrhiza Collins and Hervey 1917: 
121, pi. 2, fig. 12 (Bermuda) 
Fig. 30 b 
