Tasmanammina circumpeniformis n. gen., n. sp. is a tubular siliceous agglutinated foraminifer attached to a single compressed tasmanitid body at the prolocular end and the combination is free. Foraminiferal tests attain a length of 8 mm. Specimens were collected from large calcareous concretions within the black shale that also contains radiolarians, conodonts, sponge wall fragments and spicules, and pyrite. Conodonts from the Palmatolepis-Ancyrognathus-Polygnathus biofacies associated with the foraminifers and radiolarians in a single concretion are assigned to the Late Devonian (Famennian) Lower marginifera Zone, or younger Devonian. Black concretionary shale in the Milan section of the Huron Shale is interpreted to have been deposited in deep-water (150-200 m) as part of the basina l-foreslope sediments of an anaerobic environment.--Modified journal abstract.