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Coal Measures and Coal Mining in Iowa, including paleontology and a discussion on the coal formation; also the methods of mining by Russell T. Hartman, 1898

Coal Measures and Coal Mining in Iowa by Russell T. Hartman, 1898, Page 67

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66. [underlined][underlined][underlined][underlined][underlined]MOLLUSCOIDEA.[/underlined][/underlined][/underlined][/underlined][/underlined] The members of this sub-kingdom have their soft parts protected either by a calcareous shell or by a membranous or horny covering. The organs of respiration are in the form of tentacles or spirally coiled branchiae. The organs of digestion consist of a mouth which conducts into the stomach through a gullet. The waste matter is carried off by means of a distinct intestine ending in a distinct anus. [underlined][underlined][underlined][underlined][underlined]BRYOZOA[/underlined][/underlined][/underlined][/underlined][/underlined] (POLYZOA). Small, sometimes microscopic animals forming variously
 
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