Looks to be a part of Mollus type book cutdown to the image.  CDV size albumen.  Timothy SullivanResidence was not listed; 42 years old.Enlisted on 5/16/1861 at Oswego, NY as a Colonel.On 5/17/1861, he was commissioned into Field & Staff New York 24th Infantry.He resigned on 1/14/1863Sources used by Historical Data Systems, Inc.:New York: Report of the Adjutant-General 1893-1906Photo courtesy of Massachusetts Commandery of MOLLUS© Historical Data Systems, Inc. www.civilwardata.com