BOSTON, Dec. 30.–Samuel L. Clemens (Mark Twain) filed, to-day, in the United States circuit court, a bill in equity against Estes & Lauriat, publishers, praying that they may be restrained from further distribution of the catalogue [of] books in which they announce that a forthcoming work by Mark Twain "is now ready for sale at a price reduced from $2.75 to $2.25."