70 CORAL FORMATIONS. 
Otuhu, Paumotu Archipelago. 14° 5’ S. 141° 30’ W. 13 
miles by 3, trending north and south. No lagoon. Wooded. 
Margaret, Paumotu Archipelago. 20° 42’ S. 143° 4’ W. 
Diameter one mile, nearly circular. A small shallow lagoon with 
no entrance. Northeast side alone wooded, and in two patches. 
Teku or Four Crowns, Paumotu Archipelago. 20° 28'S. 143° 
18’ W. Diameter 14 miles, nearly circular. A small lagoon with 
no entrance. Southwestern reef bare; five patches of forest on the 
other part. 
Washington Island. Lat. 4° 41’ N. Long. 160° 15’ W. 3 miles 
by 14, trending east and west. It is a dense cocoanut grove, with 
luxuriant shrubbery. No lagoon. The shore platform is rather 
narrow. A point of submerged reef one and a half miles long 
stretches out from southwest end. Could not land on account of 
bad weather. 
Einderby's. 3°°8' S.- V71° 16" We 23>miles by Wmile nearly, 
trending NNW. and SSE.; form trapezoidal or nearly rectangular. 
Little vegetation in any part, and but few trees. The lagoon very 
shallow and containing no growing coral; its shores a coral mud, allow- 
ing the foot to sink in eight or ten inches, and covered in places with 
saline incrustations. Shore platform one hundred feet or less in 
width, and surface inclined outward at a very small angle; covered 
with three or four feet of water at high tide, and with few corals or 
shells; beyond this, falls off four to six feet, and then the bottom 
gradually inclines for one hundred yards or more. The beach very 
high and regular; rises eight feet, at an inclination of thirty to thirty- 
five degrees; then horizontal for eighty to two hundred, after which 
another rise of three or four feet. It consists below of pebbles and 
fine sand, but above of slabs and blocks of coral rock and the beach 
sandrock, those of the latter nearly rectangular and flat. This 
beach sandrock occurs in layers from ten to twenty inches thick 
along the shore, and is inclined from five to seven degrees seaward. 
Some portions are very compact, and ring under the hammer, while 
others enclose fragments of different sizes to a foot or more in 
diameter. ‘The most common coral of the beach was an Astrea 
with small cells, (near A. cerium, D.;—the specimens were after- 
wards lost.) There were also other Astras, a large lamellar Madre- 
pore, (M. cyclopea,) some fragments of which were six feet square 
and three inches thick; also Meandrine, Porites, &c. Large trunks 
of transported trees lay upon the island, one of which was forty feet 
