Since this article was written in 1861, I would have to assume identification as the 24th to be a typo.

The Times Picayune (New Orleans, LA) 10 Dec 1861

“The 27th Regiment Mississippi Infantry was organized in September through December 1861 from independant units from the Counties of Oktibbeha, Leake, Covington, Jasper and Simpson in Mississippi while these units were stationed in Pennsacola. It underwent several field consolidations with various other Mississippi units. The first was with the 24th Regiment Mississippi Infantry from October 1863 through August 1864. Another was with the 24th and the 34th Regiments Mississippi Infantry Regiments from September 1864 through April 9, 1864. And finally with the 24th, the 29th, the 30th and the 34th Regiments Mississippi Infantry from April 9, 1864 until the unit was surrendered on April 26, 1865.”
http://geocitiessites.com/Pentagon/Quarters/8424/