AGASSIZ : BAHAMAS. 71 



fauna off Burrow Cay, — Leptocephalus, Squillae, pelagic flounders, 

 Sagittae, Doliolurn, Diphyes, Cupepods, floating algae, and many larvse of 

 Crustaceans. After we passed Mores Island the specimens of the bot- 

 tom became more and more sticky, and contained a greater number of 

 Foramiuifera, changing also to a grayish color. As seen from the north- 

 west, the northern extremity of Mores Island, with its rounded hill-tops, 

 is very characteristic, and in striking contrast to the low aeolian hills 

 which form the southern part of the island. On the horizon to the 

 south is seen the low line of Great Abaco, covered with its pine "forests, 

 and to the eastward the line of the two Woollendean Cays, the outliers 

 of the former extension of Great Abaco to the west of the marls. These 

 cays are partly rocky and partly sandy. The sea, although shallow, has 

 evidently considerable force here, especially during the northers, and 

 low walls of aeolian rocks are thrown up here and there on these cays 

 just at high- water mark. "We landed on one of the cays to the north of 

 Cambridge Harbor. It consisted of aeolian rocks in an interesting stao-e 

 of decomposition, nearly marl, the holes of the rocks full of red earth and 

 of vegetable matter. The sand on the beaches was made up of the same 

 material, a little less compact and quite marly. This stage of the aeolian 

 rock seemed to be the condition immediately preceding that of the 

 locality which is marked " The Marls " on the charts extending from the 

 Woollendean Cays to the eastward towards Abaco and to the northward 

 to Little Abaco. The so called marl which we obtained just inside of 

 the cays differed greatly in its darker color from the whitish marl west 

 of Andros. It also differed materially in being made up of far coarser 

 materials, though it seemed to be fully as tough and sticky as the white 

 marl from Andros. 



As we approached the northern extremity of Great Abaco, near Nor- 

 man's Castle, we could see the aeolian cliffs on the south of it, formed 

 from the hill slopes cut away at the base. At many points huge blocks, 

 eaten away at their base, had been broken off, and looked now like huge 

 white sails scattered along the coast line. It is interesting to follow 

 to the westward of Norman's Castle the continuation of the aeolian 

 hills, which as small cays extend in a line outside of the main shore of 

 Abaco and form Rock Harbor, the lowland lying between them and the 

 mainland having all been washed away. The rocks were, as at Woollen- 

 dean Cays, nearly changed into marl, mixed with more or less vegetable 

 matter and red earth, so that very little additional disintegration would 

 change it into the sticky and half sandy bottom so characteristic of this 

 part of the Little Bahama Bank. 



