The others belonged principally to the following genera, viz., Asterias, Caryophyllea, and Madrepora.

The right bank of the river rose into steep cliffs of basalt, under which the clustered fig tree, with its dense foliage, formed a fine shady bower.

The basaltic dyke was about a mile and a half broad, and I followed it about five miles up the river.
Its summit was flat, rough, and rocky; at the distance of four miles from our camp it receded a little from the river, and there limestone was observed, crowded with fossils like that on the opposite side of the river.

Two miles farther, the bed of the river was formed by a felspathic rock, with beautiful dendrites.

A small island, with a chain of lagoons on one side, and with the river on the other, was also composed of this rock, in contact with, and covered by, basalt in several places.