In the thirty-fourth degree of latitude, renewed calms again enabled us to add to our collection, firstly, a new species of Physsophorides (_Agalma N._); secondly, a new _Diphyes_; thirdly, a new _Pelagia_, with a yellow skin on the belly, attached to which was a small Cirrhipede of the class _Cineras_; fourthly, a Medusa, with broad belly-bags, and four strong fins; fifthly, a Medusa of the same species, with five and six fins; sixthly, a very small Entomostracea of a flat form, and distinguished by its blue glossy colour, similar to that of the _Hoplia farinosa_; seventhly, a _Loligo_, probably _cardioptera Per._, remarkable on account of the largeness of its eyes; eighthly, a second species of _Phyllirhoe_, placed by Lamarck among the Heteropodes, to which class it does not, however, belong. The species found in the South Sea has no eyes, and plain feelers; on which account it was formerly considered by us as forming a distinct class, and called _Eurydice_. But, although the _Phyllirhoe_ is found to vary so remarkably in its formation, owing to the want of feet, still I consider it as nearly allied to the _Eolidia_. Ninthly, a new _Glaucus_, of a remarkably slim body, with short fins, and of a blackish-blue colour. Tenthly, a _Eucharis N._ In addition to these, no less than eight Crustacea were taken in the net. In the vicinity of Kamtschatka, the vessel sailed daily through red masses floating on the surface; on drawing up some of the water, the pail was found full of red _Calanus_, a line and a half long, with rough feelers of the same length as the body. In Kamtschatka we found the Bay of Awatscha poor in Mollusca and radiated animals, owing probably to the inconsiderable ebb and flood. The objects most frequently met with, were an ugly little _Turbo_, the empty shell of which was tenanted by a black _Pagurus_ and a _Balanus_. A large _Cyanea_ differs from the European _C. ciliata_, in the form of the stomach. Another Medusa, constituting a new kind of _Sthenonia N._, was observed; its digestive organs resemble those of the Aurelia; and about the edge, eight bunches of very long fibres project, provided, like those of the Physaliae, with two rows of suckers. The environs of St. Peter and St. Paul, lying under fifty-three degrees of north latitude, possess an insect Fauna, such as is in Europe only found in sixty and seventy degrees of latitude; as for instance, in Lapland and Finland. A great number of species are exactly similar in both regions; others of the Kamtschatkan insects have been met with nowhere else, except in Siberia, and a small number is quite peculiar to the former country. All have not yet been subjected to a diligent examination, and only the following can be with certainty mentioned.