infra corpus comitatus

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
INFRA CORPUS COMITATUS. Within the body of the county. 
     2. The common law courts have jurisdiction infra corpus comitatus; the 
admiralty, on the contrary, has no such jurisdiction, unless, indeed, the 
tide water may extend within such county. 5 Howard's U. S. Rep. 441, 451. 
    

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