DIY History | Transcribe | Scholarship at Iowa | 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 167

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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 167

[page]166.[/page]

of folds of the integument adapted for the direct breathing of air.

[underlined][underlined][underlined][underlined]CRUSTACEA.[/underlined][/underlined][/underlined][/underlined]

     This class contains those Arthropods which have branchiae and breathe the air absorbed in water. Typically the head is furnished with two antennae. Some of the appendages (legs) are modified to act as masticating organs, while the segments of the abdominal division are provided with organs of locomotion. The body is divided into three sections, the head, the thorax and the abdomen, the latter in case of the lobster and crayfish is commonly called the tail.

[underlined][underlined][underlined]Trilobita.[/underlined][/underlined][/underlined]

     This order seems to have become extinct at the close of the Paleozoic era. It in-

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[page]166.[/page] of folds of the integument adapted for the direct breathing of air. [underlined][underlined][underlined][underlined]CRUSTACEA.[/underlined][/underlined][/underlined][/underlined] This class contains those Arthropods which have branchiae and breathe the air absorbed in water. Typically the head is furnished with two antennae. Some of the appendages (legs) are modified to act as masticating organs, while the segments of the abdominal division are provided with organs of locomotion. The body is divided into three sections, the head, the thorax and the abdomen, the latter in case of the lobster and crayfish is commonly called the tail. [underlined][underlined][underlined]Trilobita.[/underlined][/underlined][/underlined] This order seems to have become extinct at the close of the Paleozoic era. It in-