I can't really help you with the tombstone information, but here is some info on your Tobias Connell that you may not have already. I'm not a Connell descendant.
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The history of Milford, by George A. Ramsdell
Concord, N.H.: Rumford Press, 1901, 1118 pgs.
page 990

Jennie Gertrude Worcester [dau of Charles H. & Kate A. (Kirby-Clogston) Worcester], b. in Tyngsborough, Mass. April 6, 1876; m (1) Jan. 5, 1883, Charles W. Amizen of Newcastle, (2) June 21, 1899, James E., son of Tobias and Mary Catherine (--) Connell of Hudson, and res. in North Chelmsford, Mass.
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Ancestry.com. Boston, 1821-1850 Passenger and Immigration Lists [database online]. Original data: Boston, Massachusetts. Passenger Lists of Vessels Arriving at Boston, Massachusetts 1820-1891. Micropublication M277, rolls # 1-36. National Archives, Washington, D.C.
Name: Tobias Connell
Arrival Date: August 20, 1849
Age: 28
Port of Arrival: Boston
Place of Origin: Ireland
National Archives' Series Number: M277
National Archives' Roll: 31

You may want to see if you can obtain this roll from the National Archives and review it yourself.

My best to you in your genealogical research.
Janice