NO. 2 FRASER : SCIENTIFIC WORK, VELERO III, EASTERN PACIFIC 137 



Only the vicinity of the southeastern extremity of the island has been 

 explored, on both sides of the extreme southeastern point and around 

 Turners Island, shore collecting on sand, rock, shingle, and reef, dipping, 

 seining, and much dredging — almost wholly in shallow water. 



Lying 7% miles south of Willards Point, the western extremity of 

 Tiburon Island, is a barren, rocky island, 4 miles by 3 miles, Esteban 

 Island, with plenty of coastal variety, rocks, reefs, gravel, shingle, and a 

 sandspit (to the southwest). There have been shore collecting along the 

 south shore and dredging to the east and southeast of the island. 



From San Miguel Point southeastward to Point San Antonio, a dis- 

 tance of 90 miles, there are no significant coastal features. The coast is 

 still low and sandy, and the water is shallow for a long distance from 

 shore, but rocky bluffs, not very high ones, appear more often than farther 

 north. The bluffs are continuous enough for 5 to 10 miles northwest of 

 Point San Antonio to form a rugged coast for this short distance. 



Directly west of Point San Antonio, 15 miles, and 8 miles from the 

 nearest Sonora mainland is the barren, rocky, volcanic islet, San Pedro 

 Nolasco Island, 2% miles long, % mile wide. The coast is largely in- 

 accessible. Off the southern end there are detached rocks, but elsewhere 

 the water is deep close to shore. Some land plants have been collected on 

 the island, and dredging has been done to the east and the northeast, in 

 45 to 110 fathoms. 



The shore for some distance east of Point San Antonio becomes much 

 higher and more rugged. The mountain peaks are nearer the coast, and 

 the coast line is much more broken with numerous small indentations, 

 projecting points, and small islands. East of Point San Antonio 2% miles 

 is Punta Doble, forming the western extremity of a large open bay, 

 Ensenada San Francisco, the shore of which sweeps eastward and then 

 southward to Cabo Arco, the southeastern extremity, 7 miles from Point 

 Doble. There are several secondary inlets, of which Puerto San Carlos, 

 nearer the northwestern end of the bay, affords the best shelter. Most of 

 the collecting in Ensenada San Francisco has been done in or near Puerto 

 San Carlos, shore collecting on rock and shingle, dipping, seining, beam 

 trawling, and dredging. 



From Cabo Arco the coast extends slightly south of east, in a series 

 of three bights, to Cabo Haro, 4 miles away. Cabo Haro is the southern 

 point of a peninsula that shuts off the inner harbor of Guaymas from the 

 open Gulf and forms the western boundary of the outer harbor and the 

 southern boundary of the middle harbor. The west face of this peninsula 



