AGASSIZ: BERMUDAS. 213 



similar lagoons, the limiting land of which has been entirely washed away. 

 Such are the three small lagoons situated in the flats to the south of East 

 Ledge and to the west of Mills Breaker, showing channels leading into 

 them from the bank similar to the Narrows which lead from the edse 

 of tlie bank to the lagoon forming Murray Anchorage. A number of 

 such open lagoons facing south are found extending into the inner 

 ■?dge of the reef flat, to the eastward and westward, directly south of 

 North Rock, as far west as the Eastern Blue Cut. On the outer face 

 of the reef south of Western Blue Cut, at the Chub Cut, the Chub 

 Heads, and between High Point and the Chaddock Bar, a number of 

 such open lagoons can be traced. Long Bar is a flat ledge which 

 once may have formed the barrier of a narrow lagoon open at its two 

 extremities. 



The so called reef off tlie south shore I look upon as a series of ledges, 

 the remnants of the cliffs of the shore when it formerly extended to the 

 present position (Plates XXL, XXIII.) of the reef One cannot fail to 

 read tlie mode of formation of this I'eef on seeing the work of destruc- 

 tion which has been and is still going on all along that coast (Plate XIX.). 

 The shore of the island is gradually being eaten away at all the low- 

 points leading either into sinks like those of Sinky or of Hungry Bay, or 

 into more elongated sinks like those which will be formed when the ponds 

 lying close to tlie shore to the westward of Tuckerstown are invaded by 

 the sea (Plate XIV.). The next process is the formation of a line of 

 islands, such as still protect Castle Harbor and St. George Harbor on 

 tlieir sea face (Plate XXL), oi', as is well seen at Sinky Bay, where the 

 line of rocks to the north and south of the opening is still connected 

 with the shore line by a beach or neck, but which will soon disappear 

 and change that bay and the one to the north of it into an extension of 

 Whale Bay. On the sea face of that part of the coast extends a long line 

 of isolated rocks, islets, rocky patches, and sunken ledges, which plainly 

 tell of their former connection in a continuous ridge. Parts of these 

 ledges are worn to the water's edge, forming flat ledges or mushroom- 

 shaped rocks overgrown with Algse and Serpulte, and likewise the Ser- 

 pulfe atolls (Plates XXIV.-XXVI.) and boilers of the shore line, similar 

 to those which form the outer reef, and are separated by a belt of water 

 varying from one and a lialf to four fathoms close to the lee side of the 

 reef. At some points of the shore it is difticult to separate the line 

 of the outer reef, and of its ledges extending towards the shore, from 

 the ledges wliich form the Serpulse reefs of the shore line itself 

 (Plate XXVL). 



