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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 115

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[page]114.[/page] through an opening near the anus. Usually there is an external or internal shell. [image: very faint drawing with letter labels] [caption]Diagram of Mollusk.-- From Nicholson's alteration of [?Lankarter's?] drawing.[/caption] Description. m, mouth; a, anus; l, liver; f, foot; sh, shell attached to mantle; h, heart; pc, pericardium; n, kidney, opening internally into the pericardium; k, kidney opening, exterior; br, gill; cg, one of cerebral ganglia connected by commissures with pleural ganglion, pg; and pedal ganglion, fg; vn, visceral nerve-cord extending backward, carrying visceral ganglia, vg.
 
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