388 
PACIFIC SCIENCE, Vol XV, July 1961 
order DICTYOTALES 
FAM. DICTYOTACEAE 
Pachydictyon coriaceum (Holmes) Okamura 
Dawson, 1954, 1959, 1959c; Dawson, Neu- 
shul, Wildman, I960 
Coos Bay, Oreg., tx> Punta Entrada, Isla Mag- 
dalena, Baja Calif.; northern Gulf of Calif, 
south to Isla Ildefonso 
Dictyota binghamiae J. Agardh 
Dawson, 1954; Dawson, Neushul, Wildman, 
I960, I960 a 
Coos Bay, Oreg., to central Baja Calif. 
Dictyota concrescens Taylor 
Dawson, 1954 
Cabo San Lazaro, Isla Magdalena, Baja Calif. 
Dictyota crenulata J. Agardh 
Dawson, 1954, 1954c, 1959 
Isla San Benedict©, Revillagigedo Arch.; Isla 
San Diego, Gulf of Calif., to Puerto Cule- 
bra, Costa Rica 
Dictyota dichotoma (Hudson) Lamouroux 
Dawson, 1954, 1957, 1959 
Gulf of Calif.; tropical Pacific Mexico and 
Central America ?; Galapagos Arch. 
Dictyota divaricata Lamouroux 
Dawson, 1954, 1957, 1957*, 1959 
Isla Guadalupe, Baja Calif.; Revillagigedo 
Arch.; La Paz, Gulf of Calif., to Isla La 
Plata, Ecuador 
Dictyota flabellata ( Collins ) Setchell & Gardner 
Smith, 1944; Taylor, 1945; Doty, 1947; Daw- 
son, 1954, 1959, 1959c; Dawson, Neushul 
& Wildman, I960 
Southern Calif, to Punta Santa Rosalia, Baja 
Calif.; northern Gulf of Calif, south to 
Isla Tortuga 
Dictyota friabilis Setchell 
Dawson, 1957*; Dawson, Neushul & Wild- 
man, 1960^ 
Islas San Benito, Baja Calif.; Golfo de Nicoya, 
Costa Rica ? 
Dictyota major Taylor 
Taylor, 1945 
Galapagos Arch. 
Dictyota masonii Setchell & Gardner 
Dawson, 1954, I960* 
Isla Margarita, Baja Calif. ?; Isla Clarion, 
Revillagigedo Arch., Isla del Cano, Costa 
Rica ? 
Dilophus okamurai Dawson 
Dawson, 1954 
Vicinity of San Lucas, Baja Calif. 
Dilophus pinnatus Dawson 
Dawson, 1954 
Miramar, Nayarit 
Dictyopteris cokeri (Howe) Taylor 
Taylor, 1945 
Galapagos Arch. 
Dictyopteris delicatula Lamouroux 
Dawson, 1954 
Revillagigedo Arch.; Clipperton I. 
Dictyopteris diaphana Taylor 
Taylor, 1945 
Galapagos Arch. 
Dictyopteris johnstonei Gardner 
Silva, 1957 (indicating probable identity 
with D. zonarioides) 
Santa Cruz I., Calif., to Islas San Benitos, Baja 
Calif. 
Dictyopteris membranacea (Stackhouse) Batters 
Dawson, 1954 
Isla Guadalupe; Scammons Lagoon, Baja Calif. 
Dictyopteris repens ( Okamura ) Bprgesen 
Dawson, 1957, 1957*, 1959, 1959* 
Isla Carmen, Gulf of Calif.; Golfo de Nicoya, 
Costa Rica; Clipperton I. 
Dictyopteris zonarioides Farlow 
Dawson, 1954, 1959', 1959c; Dawson, Neu- 
shul & Wildman, I960 
Southern Calif, to San Jose del Cabo, Baja 
Calif.; northern Gulf of Calif, south to 
Isla Ildefonso 
