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 116

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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 116

[page]115.[/page]

[underlined][underlined][underlined][underlined]LAMELLIBRANCHIATA.[/underlined][/underlined][/underlined][/underlined]
(CNONCHIFERA, PELECYPODA).

     In this class of the Mollusks the mantle is divided into two lobes each of which secretes a shelly covering, the animal is, therefore, more or less enclosed in a bivalve shell. The valves are right and left, not ventral and dorsal as in the Brachiopoda. The head is not in this case distinctly differentiated. There are one or two pairs of lamellar gills on each side of the body. The sexes are distinct or united.

[underlined][underlined][underlined]PECTINACEA.[/underlined][/underlined][/underlined]

     Shell inequivalve or sub-equivalve, hinge usually toothed, [?pullial?] line entire.

[underlined][underlined]Pectinidae.[/underlined][/underlined]

     Shell sub-equivalve, eared, free or attached, by right valve; usually a notch under ear of right valve for passage of byssus; scar of adductor

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[page]115.[/page] [underlined][underlined][underlined][underlined]LAMELLIBRANCHIATA.[/underlined][/underlined][/underlined][/underlined] (CNONCHIFERA, PELECYPODA). In this class of the Mollusks the mantle is divided into two lobes each of which secretes a shelly covering, the animal is, therefore, more or less enclosed in a bivalve shell. The valves are right and left, not ventral and dorsal as in the Brachiopoda. The head is not in this case distinctly differentiated. There are one or two pairs of lamellar gills on each side of the body. The sexes are distinct or united. [underlined][underlined][underlined]PECTINACEA.[/underlined][/underlined][/underlined] Shell inequivalve or sub-equivalve, hinge usually toothed, [?pullial?] line entire. [underlined][underlined]Pectinidae.[/underlined][/underlined] Shell sub-equivalve, eared, free or attached, by right valve; usually a notch under ear of right valve for passage of byssus; scar of adductor