New York, June SS5. - The steamboat Seawarihaka, which ran from Peck slip up the sound to Glen ('ove, L. L., took flré at 4;30this afternoon while offRandall's island, East river. The flre was caused by an explosión in the engine room and the middleof the steamboat was soon in llames. Tlie pilot, Charles Srnith, reniained at lus post until nearly burned to deatli, and succeeded in 1 ieachingthe vseelon asunken meadow adjoining the island. Many persons Bprang overboard, and were dlrowned. Many others in the stern of the vessel coula not get off and wen; burned to death. Of 500 persona supposed to hayebeenon board, 50 are b lieved to have perished. The bodies of about 80 were reco i Onlythose of Dr. Debois, a wealthy eenileman, residence unknowp, and Mary Reed a young woman, were identilied. Ainon'iHie persons of prorninence knowti to have been on board were ('liarles A. Uaná, editor of the Sun, S. M. Barlow, Col. W.B. Chase, and K. Ij. Rocbester, treasurer of the Western Union Telegraph eompany. The vessel burned to the water' edge and will be u total loss.