Statistics for occurrence #1 of “Thomas McEllmell” in page 244 of Admiral David D. Porter, The Naval History of the Civil War.:

...'s Mate, John Bath. Acting-Master's Mate, Anthony Loper. Acting-Master's Mate, J. W. Cortelyou. Acting-Master's Mate, Thomas Levindsell. Acting-Master's Mate, R. M. Clark. Acting-Master's Mate, Thomas McEllmell .
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† Thomas McEllmell 2 2 0 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.