Definition
Latin: "within the body of the county." A jurisdictional term identifying waters or territory that fall within the territorial limits of a county and are therefore subject to common-law court jurisdiction rather than admiralty jurisdiction. Waters classified as infra corpus comitatus lie beyond the reach of admiralty courts; waters outside that boundary — on the open sea or where the tide flows beyond county limits — fall under admiralty authority.
The concept is fundamentally a jurisdictional line-drawing tool. Its operative effect is to confirm common-law jurisdiction over inland or enclosed waters and to deny admiralty jurisdiction over the same. The test is geographic and tidal: if a water body lies within the recognized territorial bounds of a county and is not tidal, it is infra corpus comitatus. Where tidewater penetrates inland into a county, the analysis becomes contested, and admiralty jurisdiction may follow the tide even into county-bounded waters.
Common Confusion
Infra corpus comitatus is sometimes confused with the related concept of fauces terrae ("jaws of the land"), which describes enclosed arms of the sea, bays, and inlets that lie within the embrace of the land and may also be treated as within county limits. The two concepts overlap but are not identical. Fauces terrae describes the physical geography of an enclosed water body; infra corpus comitatus describes the legal consequence — that the water lies within county jurisdiction and is therefore subject to common-law, not admiralty, authority. A body of water may qualify as fauces terrae precisely because it is infra corpus comitatus, but the terms operate at different levels of the analysis.
The term should also not be confused with the body of the county as a venue concept in criminal and civil procedure, where "within the body of the county" determines the proper county for jury selection or trial. That usage shares the Latin phrase but applies it to an entirely different jurisdictional problem.
Why It Matters in Research
Researchers working in admiralty, maritime, or early American jurisdictional history will encounter this term as a threshold marker in disputes over whether a common-law court or an admiralty court had authority to hear a case. Getting that threshold wrong meant litigating in the wrong forum entirely, with potentially no remedy.
The term's importance peaks in the period before the Supreme Court's expansion of federal admiralty jurisdiction in the mid-nineteenth century. The 1847 decision in Waring v. Clarke, 46 U.S. (5 How.) 441, is the pivotal case. The Court held that federal admiralty jurisdiction extends to tidewater as far as the tide flows — a ruling that directly eroded the infra corpus comitatus defense. After Waring, the mere fact that waters lay within county limits did not automatically exclude admiralty jurisdiction if those waters were tidal. Researchers reading pre-Waring sources will find infra corpus comitatus treated as a near-absolute bar to admiralty jurisdiction; post-Waring sources qualify it substantially.
English sources use the term differently and more categorically than American sources. English common-law courts historically treated waters infra corpus comitatus as completely exempt from admiralty, with no tidal exception. American courts, particularly federal courts after Waring, applied a more permissive admiralty jurisdictional standard. A researcher relying solely on English treatises — Molloy's De Jure Maritimo, for instance, cited by Burrill — will encounter a stricter rule than American courts ultimately adopted.
The term also surfaces in historical discussions of the corpus comitatus doctrine in criminal jurisdiction, particularly in cases where acts committed on rivers or harbors raised questions about which court had competent authority. Colonial-era records and early state court opinions frequently wrestle with this boundary.
Historical Dictionary Support
The historical dictionaries are in close agreement on the core definition. Black's (both editions), Burrill, Bouvier, and Rapalje & Lawrence all define the term as "within the body of the county" and tie it to the exclusion of admiralty jurisdiction. There is no meaningful divergence on the basic meaning.
Burrill provides the most substantive treatment, citing Kent's Commentaries and Molloy's De Jure Maritimo, and noting the significance of Waring v. Clarke for the American rule. Bouvier cross-references Waring directly at 5 How. 441, 451, and flags the tidal exception — the most important qualification to the general rule. Black's defines the concept but does not develop the post-Waring tidal complication as explicitly as Burrill and Bouvier do.
What the historical dictionaries collectively miss is any discussion of how the concept functioned in American state court practice, where the line between state common-law courts and federal admiralty jurisdiction was also at stake. The dictionaries frame the question as English common law versus admiralty, but American researchers must layer in the federal-state dimension as well.
Jurisdictional Note
The term operates primarily in English and American admiralty and common-law contexts. American federal courts after Waring v. Clarke apply a tidal-extension rule that is broader than the traditional English rule. Researchers working in Canadian or other common-law jurisdictions should verify independently whether the English categorical rule or an analogous tidal extension applies in those systems.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Admiralty Jurisdiction; Fauces Terrae; Common Law Courts and Admiralty Conflict