The Special Pony Express.St. Joseph, Nov. iiL—The extra Pony Express, which left Fort Kearney on Wednesday, Novem-vember 7th, with the election news, arrived in Salt Lake City in three days and four hours, the distance being 950 miles. The last 45 miles was made in' three hours and ten minutes, and this 45 miles of the route is the most mountainous of the whole road. The regular pony express, leaving St. Joseph on the Sth inst., arrived at Salt L ike— distance 1200jmiles—in four days and twenty-throe hours. It had been snowing for thirty-six hours when the pony left Salt Lake City.