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PACIFIC SCIENCE, Vol. XV, July 1961 
Gastroclonium coulteri (Harvey) Kylin 
Scagel, 1957; Dawson, 1954, 1958c; Dawson, 
Neushul & Wildman, I960 
Nootka Sound, British Columbia, to Bahia 
Asuncion, Baja Calif. 
Coeloseira compress a Hollenberg 
Dawson, 1954; Dawson, Neushul & Wild- 
man, 1960a 
Pacific Grove, Calif., to Isla Asuncion, Baja 
Calif. 
Coeloseira pacifica Dawson 
Dawson, 1954 
Northern Gulf of Calif, south to Guaymas 
Coeloseira parva Hollenberg 
Dawson, 1954 
Redondo, Calif., to Punta Santa Rosalia, Baja 
Calif. 
order CERAMIALES 
fam. CERAMIACEAE 
Crouania attenuata (Bonnemaison) J. Agardh 
Dawson, 1954, 1957 
Isla Guadalupe; Bahia Vizcaino; Rocas Alijos, 
Baja Calif. 
Lejolisia colomhiana Taylor 
Taylor, 1945 
Isla Gorgona, Colombia 
Gymnothamnium elegans (Schousboe) J. 
Agardh 
Hollenberg, 1948; Dawson, 1954; Taylor, 
1945 
Southern Calif.; Isla Clarion, Revillagigedo 
Arch.; Galapagos Arch. 
Antithamnion alternans Gardner 
Gardner, 1921b 
Cook Inlet, Alaska 
Antithamnion asymmetricum Gardner 
Gardner, 1927c 
Sitka, Alaska 
Antithamniun baylesiae Gardner 
Doty, 1947 
South Slough, near Charleston, Oreg.; Mon- 
terey Peninsula, Calif. 
Antithamnion breviramosus Dawson 
Dawson, 1954, 1957, 1957*, 1959, I960* 
Santa Catalina I., Calif., to Isla del Rey, Pa- 
nama; southern Gulf of Calif. 
Antithamnion defectum Kylin 
Scagel, 1957 
Northern British Columbia to Monterey, 
Calif. 
Antithamnion dendroideum Smith & Hollen- 
berg 
Smith, 1944 
Monterey, Calif. 
Antithamnion densiusculum Gardner 
Scagel, 1957 
Southern British Columbia to Pacific Grove, 
Calif. 
Antithamnion dumontii Dawson 
Dawson, I960* 
Isla del Cano, Costa Rica, to Isla Jicaron, Pa- 
nama 
Antithamnion floccosum (Muller) Kleen 
Scagel, 1957 
Southern British Columbia to northern Wash. 
Antithamnion gardneri G. De Toni 
G. De Toni, 1935; Doty, 1947 (as A. tenuis- 
simum ) 
Coos Bay, Oreg.; La Jolla, Calif. 
Antithamnion glanduliferum Kylin 
Scagel, 1957; Dawson, 1954d; Dawson, Neu- 
shul & Wildman, 1960a 
Southern British Columbia to Isla Asuncion, 
Baja Calif. 
Antithamnion kylinii Gardner 
Scagel, 1957; Dawson, 1954 
Victoria, British Columbia, to Punta San 
Hipolito, Baja Calif. 
