A large brownish _Gecarcinus_ lives entirely on the land, in holes of his own making; his gills accordingly are not open combs, but consist of rows of bags closely pressed together, and somewhat resembling bladders. _Hippa adactyla_ F. is very frequent here, and keeps itself concealed under the sands on the sea-shore. It was from these that Fabricius, who has given a wrong description of their legs, formed his species _Hippa_; Latreille mentions them by the name of _Remipes testudinarius_. Six kinds of _Pagurus_. Of Crustacea already described, _Palaemon longimanus_, _Alphaeus marmoratus_, and _Squilla chiragra_; the legs of the last are red, and formed like a club; it uses them as weapons of offence or defence, and inflicts wounds in striking them out by a mechanism peculiar to itself. The number of insects collected on the low land was very small; among them the _Staphylinus erytrocephalus_, also a native of New Holland; an _Aphodius_, scarcely to be distinguished from the _limbatus Wiedem._ of the Cape of Good Hope; an _Elater_ of the species _Monocrepis_; of _Oedemera_, three varieties of the species _Dytilus_, to which belong the _Dryops livida_ and _lineata_ F.; two small varieties of _Apate_; _Anthribus_, _Cossonnus_, _Lamia_, _Sphinx pungens_, and a large _Phasma_. No place could be more convenient for the observation of the Mollusca and Radiata than Cape Venus. At a few hundred paces from the shore is a coral reef, which at low water is completely dry. In the shoal water, between the reef and the shore, is found the greatest variety of the more brittle kinds of coral, and among their sometimes thick bushes, mollusca and echinodermes lie concealed. The rapid movements of a small _Strombus_, which, when taken, beat about it with its shell, formed like a thin plate of horn, and armed with sharp teeth, were very curious. On breaking the stone which is formed by fragments of coral, a _Sternaspis_ was found burrowing in the interior. Seven classes of Holothuria were examined; three belonged to the species of _Holothuria_, called by Lamarck _Fistularia_, but which name had already been given by Linnaeus to the tobacco-pipe fish; the fourth was a species newly discovered, and to which we appropriated the name of _Odontopyga_, because the fundament is armed with five calcareous teeth; the belly is furnished with small tubes, and the back covered with bumps. Two more belong to the species _Thyone_; and the seventh kind of Holothuria ought, properly speaking, to form a class apart, not having tubular feet, but adhering, by means of their sharp skin, to extraneous objects, on which account they might be called _Sinapta_; their feelers are fringed and they live concealed among stones. We found five small kinds of sea-leeches; and among three kinds of star-fish, the _Asterias Echinites_, the large radii of which easily inflict a severe wound; another had the form of the _Asterias Luna_, was eight inches in diameter, without radii, and had more the