The capital of this State is VICTORIA, formerly SANTANDER, a town of 12,000 inhabitants. TAMPICO DE TAMAULIPAS, on the northern bank of the Panuco, which enters the Mexican Gulf five miles below the town, is the principal commercial port of the State. Its bar is dangerous and its harbor considered unsafe. Large vessels cannot approach the town, which is situated among extensive marshes. It is visited almost every year by the yellow fever; yet its foreign commerce is extensive and appears to be increasing. SOTO LA MARINA is a small village and haven at the mouth of the river Santander, on its left bank. It is composed chiefly of Indian huts, and contains about 3,000 inhabitants. MATAMOROS lies on the right bank of the Rio Grande or Rio Bravo del Norte, at the distance of ten leagues from its mouth. It contains about 10,000 inhabitants, who have become well acquainted with the people of the United States during the recent war. The climate of Matamoros is hot and sickly, like that of Tampico or Vera Cruz; but as the river upon which it lies is perhaps the most important in Mexico, and has proved navigable by steamers for a considerable distance in the interior, it is probable that this place will become the depot of a large and valuable commerce destined for the supply of the northern States of the Mexican confederacy. By the treaty of 1848, the Rio Grande became the boundary between large portions of the two republics; and as the intervening country between the Nueces and the Rio Grande is not considered at present attractive for agricultural purposes, it is likely that it will long continue unoccupied and unsettled, thus leaving the whole of our commerce to be conveyed to Matamoros, or to our own neighboring settlements on the opposite shore, for distribution throughout the valley of the Rio Grande. [Illustration: TAMPICO.] The other towns and villages in Tamaulipas worthy of note, are Altamira, Horcasitas, Coco, Escandon, Llera, Santillana, Padilla, Hoyos, Guadalupe, Reinosa, Camargo, Mier, Revilla, the most important of which lie on the margin of, or near, the Rio Grande. ANCIENT REMAINS IN TAMAULIPAS. The only remains of Indian architecture and civilization of whose existence we are aware, are those described in the small work published by Mr. B. M. Norman in 1845, to which we have already alluded, entitled "Rambles by Land and Water or Notes of Travel in Cuba and Mexico." This gentleman's notices of the antiquities in this region are exceedingly brief, sketchy and indefinite, nor are the illustrations with which his text is accompanied, calculated to convey more vivid pictures of the relics he visited or discovered in the course of his investigations along the margins of the Panuco.