70 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 1 



the waters, the brilliant red Sally Lightfoot crab scuttles about among the 

 boulders on the beach, and coral masses appear at or near the surface. 



With the exception of some shore collecting at Grayson Cove, in the 

 northwestern part of Cornwallis Bay, all the stations are in the vicinity 

 of Braithwaite Bay and Cape Rule. The bouldery shore provides much 

 good material, and the coral masses protect an interesting association of 

 species. Dredging in depths to 75 fathoms, mostly in nullipore bottom, 

 has been profitable but not startlingly so. 



Clarion, the only other sizable island in the group (San Benedicto 

 Island, very small, and Roca Partida, a rocky islet, have not been visited), 

 lies 214 miles to the westward of Socorro Island, but separated from it by 

 water of a depth of over 2,000 fathoms. It, also, is volcanic, and in many 

 of its physical features it resembles Socorro. Instead of a single large 

 cone, there are three, 1,100, 933, and 959 feet high. The island is 5% 

 miles long, east and west, and 2 miles wide, rectangular or trapezoidal 

 in shape. It is abrupt to the north, west, and east, but slopes much more 

 gradually to the south from a high ridge running east and west. The 

 slope flattens more toward the sea, with the area approaching the two 

 southern beaches (the only beaches on the island) not so far from being 

 level. There is a large dry lagoon near Sulphur Bay. Chart 47. 



Instead of having distinct points at the four corners, as Socorro has, 

 there is one rocky point to the southwest; but at or near the other corners 

 there are conspicuous outlying rocks or rocky islets — Monument Rock to 

 the northwest, Shag Rock, somewhat moved southward, to the northeast, 

 and Pyramid Rock to the southeast. The only bay, and it is not very 

 prominent, is Sulphur Bay, on the south shore, \\' 2 miles east of Rocky 

 Point. 



The surface has much the same general appearance as Socorro, but 

 there is more vegetation, even if the most of it is cactus. The fauna is 

 similar in type to that of Socorro. The island is an important breeding 

 place for birds. 



Much shore collecting and inland collecting have been done at Sul- 

 phur Bay and around the lagoon back of it, much dredging in and off this 

 bay, with conditions much similar to those at Braithwaite Bay; and there 

 are four stations located north of the west end of the island. 



Clipperton Island 



Plate 75 



Away to the southeast of the Revilla Gigedo group, 515 miles from 

 Socorro Island, lies the isolated Clipperton Island (10° 17' North, 109° 



