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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 23

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22. Productidae Productus marginicinctus, Prout, 1855: Transactions Saint Louis Academy of Science, Vol. I., page 43. P. wortheni, Hall, 1858: Geology of Iowa, Vol I., p. 635 Plate III figure .7. This species was named from a band, which on a few specimens, borders the front and sides of the ventral valve. But this characteristic is by no means constant; for, out of about thirty specimens examined by the writer, but one had the smallest fragment of the marginal band. Shell small, one half to three fourths inch in width, length usually somewhat less, although in some cases the length exceeds the breadth. In form the shell
 
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