_Fig._ 5. and 6. are the Barnacles called Conchæ Anatiferæ: these are the sorts so well known to sailors, and formerly supposed to produce a large species of duck called a Barnacle. These consist of five shells. The tube, that supports one of these kinds, branches out like some species of corallines, bearing a shelled animal at the end of each branch. They are generally found adhering to pieces of wood in the sea, and most ships have some of them sticking to their bottoms. Those of the southern and warmer climates are generally of a larger kind than those of the colder and more northern climates. The next division of these animals is, those that adhere by the base of their shells, having no stems. Here I must observe, that the bottoms of the several species of this division conform in shape to the substances they adhere to, or grasp them in such a peculiar manner, as to render their situation secure from the violence of the element they live in. Another provision of nature for the security of these animals are the four opercula, which, upon their retreating into the great shell, they can draw to so close after them, as to secure themselves from outward danger. _Fig._ 7. represents the Whale Barnacle, called Pediculus Ceti, just as it was cut off the whale’s lip, with the seven naked Barnacles with ears, already described. _Fig._ 7.a is the bottom of the shell. This has the appearance of the gills of a mushroom. All the spaces between these laminæ were filled with the blubber of the whale: by this means they adhere to the gristly skin of the fish. The narrow cavities between the branched laminæ are the places where the ligaments or tendons, that move the opercula, are inserted. _Fig._ 8. is the Cup Barnacle, taken off an East India ship from Sumatra. The testaceous flat bottom of this was marked with the seams and lines of the sheathing, and with the rust of the nails. In one of these shells the animal is represented protruding his claws thro’ the opercula. _Fig._ 9. is called the Bell-shaped Barnacle. This was taken off the bottom of a ship from Jamaica, and had its flat testaceous base marked as the former. _Fig._ 10. This represents part of a most elegant specimen in the curious collection of Dr. John Fothergill. It is called the Tulip Barnacle, and very properly, as well from the shape of its shell, as the beautiful stripes of red mixt with white. It adheres to a piece of the true red coral, and was fished up near Leghorn, on the coast of Italy. It is not improbable, but that these groups of Barnacles, growing at the same time with the animals that formed the red coral, may have received an addition to their fine red colour from the coral.