no. 10 dawson : marine algae, gulf of california 353 



Algal Collection Stations 

 Allan Hancock Expedition — 1940 



See Volume I, part 3, of this series for detailed charts of these stations. 



Sta. 1034-40. Outer Gorda Banks, Cape District, Lower California, Jan. 20, 1940. 

 Dredging in 118-140 meters on coralline sand bottom. Position: 23° 01' N. 

 —109° 28' W. Surface 22.7°C., bottom 16°C. D. 36. 



Sta. 1035-40. Inner Gorda Banks, Cape District, Lower California, Jan. 20, 1940. 

 Dredging in 140-150 meters on coralline sand bottom. Position: 23° 02' N. 

 —109° 30'W. Surface 22.7°C., bottom 16°C. D. 37. 



Sta. 1037-40. Boca de la Trinidad, Lower California, Jan. 21, 1940. Dredging in 

 about 100 meters over coralline sand bottom. Position: 23° 38' N. — 109° 29' 

 W. Surface 22.1°C., bottom 14°C. D. 38-39. 



Sta. 1038-40. Guaymas Bay, Sonora, Jan. 22, 1940. Dredging in 4-6 meters on 

 muddy bottom with little animal life. D. 49-61. 



Sta. Dawson 7-40. Guaymas Bay, Sonora, Jan. 23, 1940. Shore collecting in 

 very shallow water at low tide along edges of lagoons adjacent to harbor. 

 Bottom of loose rocks, fine sand, and muck. Principal association: Entero- 

 morpha, Padina, Polysiphonta, and Sargassum in large masses. Codium 

 and GraaVaria occasional. Surface 17.5°-20.0°C. D. 62-81. 



Sta. 1039-40. Outside Guaymas Bay, Sonora, Jan. 23, 1940. Dredging in 12-20 

 meters over bottom of broken shell and mud. Scinaea latifrons most abun- 

 dant. D. 82-88. 



Sta. 1042-40. Turner's Island off south shore of Tiburon Island, Gulf of Cali- 

 fornia, Jan. 24, 1940. Shore collecting at extreme low tide on reef along 

 north end of island. Algae very abundant in number as well as variety. 

 Sargassum, articulated corallines, Padina, Colpomenia, Gigartina, etc., 

 most abundant. Surface at ship 15.6°-16°C. D. 89-135. 



Sta. 1044-40. Tiburon Island, Gulf of California, Jan. 25, 1940. Beam trawling 

 in 4-32 meters off south shore of island, adjacent to Turner's Island. Sur- 

 face 15.5°-16°C. D. 136-155. 



Sta. 1045-40. Tiburon Island, Gulf of California, Jan. 25, 1940. Shore collecting 

 at low tide on south shore opposite Turner's Island. Beach of rock shingle 

 covered principally by Padina Durvillaei and Sargassum asymmetricum. 

 Rock cover otherwise mostly of articulated corallines. Surface at ship 15.5°- 

 16°C. D. 156-166. 



Sta. 1046-40. Puerto Refugio, Angel de la Guardia Island, Gulf of California, 

 Jan. 26, 1940. Seine haul over sand just off the beach, south shore of bay. 

 Surface 15.5°C. D. 167-178. 



Sta. 1048-40. Same locality and date. Dredge haul in 22-44 meters. Mem- 

 branaceous reds conspicuous. Surface at ship 15.5°C., bottom in 38 meters, 

 14°C. D. 179-188. 



Sta. 1049-40. Same locality and date. Shore collecting at low tide on rocky shore 

 and benches, west side of bay. Algae very abundant in number and variety. 

 No outstanding dominances, however. Surface at ship 15.5 °C. D. 189-227. 



