Provo, UT, USA: Ancestry.com Operations, Inc., 2010.
Original data: Book Indexes to Boston Passenger Lists, 1899-1940. Microfilm, T790, 107 rolls. Records of the Immigration and Naturalization Service, Record Group 85. National Archives, Washington, D.C.
The transcribed index says the ship arrived 28 Apr 1907, but the image doesn't have a date (on this page or the first page of the list). If it sailed 26 Apr (see other source), it could not have arrived as early as 28 Apr.