PENARTH.—At 7.30 P.M. on the 7th March, in answer to signals of distress, the Life-boat Joseph Denman was launched, and boarded the brig Crocodile, of Dartmouth, which vessel had got ashore on the west end of Cardiff sands. A strong gale was blowing from N.W., and the master requested the Life-boat might lay by him till out of danger. This was done, and with the flowing tide the Crocodile floated off. The Life-boat returned to its station towards midnight..