The case of the rebel ram Stonewall, in which the United States has instituted an ac tion against Messrs Arman, Erlanger and others, will come off in the civil tribunal of Paris in a few days. M. Arman is a member of the Corps Legislatif and a shipbuilder, and it was he who contracted, in 1863, to build and arm four steamers, ostensibly for the Pa cific trade, but which were to be paid for by Slidell, and were evidently destined for the Confederate service. Their delivery was pre vented by the interference of this Govern ment, and the vessels were disposed of to Prussia and Peru. But another contract was made, the same year, for two rams, which were finished and equipped, one of which, under the pretext of a sale to the Danish Gov ernment, was handed over to Capt. Page, of the Confederate service, who manned it with the crew of the pirate Florida, took it to Fer rol, Lisbon and, finally, to Havana, where it came into our hands. The second ram was solid to Prussia in good faith. The United States now demand that the sum, exceeding a million and a half, paid for the construction of these vessels, and an indemnity of over half a million, shall be paid by the builders. It is claimed that the United States alone can raise fleets and armies and levy taxes for this purpose; that the Confederate States never had a legal existence, and that consequently the money which was paid for those vessels, being raised by taxation, was part of the na tional property and must be restored.