118 Bulletin American Museum of Natural History. [Vol. XXXI, 



Tiburon is the largest island in the Gulf; it is thirty miles long by about 

 fifteen in width, and has a height of 4000 feet. It is separated from the 

 Mexican mainland by a channel from one to three miles wide, and is inhab- 

 ited by Seri Indians reputed to be dangerous to small parties. 



Angel de la Guardia is near the western shore of the Gulf. It is forty 

 miles long by about ten miles wide, and has a height of about 4000 feet ; it 

 is without fresh water and is uninhabited. 



San Esteban is exceedingly rough and mountainous with a height of 

 1800 feet and a diameter of about four miles. It lies eight miles southwest 

 of Tiburon, is without fresh water and is uninhabited. 



Carmen, near the Peninsula, is seventeen miles long by five and a half 

 miles wide, and has a height of 1500 feet. Important salt-works are located 

 here. 



List of Species. 



Delphinid^e. Porpoises, Dolphins, etc. 



Porpoises were observed almost daily while the 'Albatross' was in the 

 Gulf of California. They were especially numerous about the head of 

 Concepcion Bay, where a band of two hundred or more came near the 

 anchorage and showed little fear of the launch which several times passed 

 among them. 



1. Tursiops nuuanu Andrews. Nuuantj Dolphin. 



Two skulls, Santa Catalina Island, April 16. 



The skulls obtained by the ' Albatross ' Expedition at Santa Catalina 

 Island, when compared with a skull obtained by Mr. J. T. Nichols, in the 

 Pacific (Lat. 12° N., Long. 120° W.), were found to be identical. The 

 species was then described by Mr. R. C. Andrews in Bull. Am. Mus. Nat. 

 Hist., Vol. XXX, Art. IX, pp. 233-237, August 26, 1911. 



2. Tursiops gilli Ball. Gill's Dolphin. 



Skull, San Bartolome Bay, March 14. 



Porpoises were seen daily while the ' Albatross ' remained in San Barto- 

 lome Bay. The skull obtained was found on the beach with portions of 

 the skeleton. 



3. Globicephalus scammoni Cope. Scammon's Black-fish. 



Twelve skulls, Santa Cruz Island, April 16. 



There were many skulls and skeletons of this species on the beaches at 



