A conchological manual

Name: A conchological manual
Author: Sowerby, G. B. (George Brettingham)

Sowerby, G. B. (George Brettingham)

Mollusks -- Dictionaries; Shells -- Dictionaries

6. CONILITES. Like Belemnites, but external shell thin at the apex.
        Fig. 470.

    ORTHOCERATA. Bl. The first family of Polythalamacea, Bl. containing the
    genera Belemnites, Conularia, Conilites, Orthoceras and Baculites. De
    Blainville remarks that the genera included in this family are all
    fossils, and known very imperfectly, in consequence of the greater part
    of the specimens being only casts.

    ORTHOCERATITES. Auct. _Fam._ Orthocerata, Lam. and Bl.--_Descr._
    Straight, conical, divided into numerous chambers by simple septa
    perforated by a central siphon. O. annulata, fig. 464.

    OSTEODESMA. Desh. PERIPLOMA, Schum.

    OSTRACEA. (_Ostracées_, Lam.) A family belonging to the second section
    of the order Conchifera Monomyaria, the shells of which are described
    as irregular, foliaceous, sometimes papyraceous, with the ligament
    wholly or partly interior. The principal difference between the
    Ostracea and the Pectinides consists in the absence of the auricles and
    the foliated structure of the shells, for, although the Spondylus has
    ex-foliations or spines upon the external surface, the shell itself is
    compact and firm. This family contains the genera Gryphæa, Ostrea,
    Vulsella, Placuna, Anomia, which may be thus distinguished:--

        1. PEDUM. Flat, turned up at the sides, an hiatus for the passage
        of a byssus. A triangular disc on the hinge. Fig. 179.

        2. OSTREA. Foliaceous, irregular, hinge on a small triangular disc.
        Including Dendostrea, Ostræa, Exogyra, Gryphæa. Fig. 180 to 183.

        3. PLACUNA. Two diverging ribs near the umbones. Fig. 184.

        4. PLACUNANOMIA. The same, but attached by fibres passing through a
        hole in one valve. Fig. 189 to 191.

        5. ANOMIA. No costæ, attached by a bony substance passing through a
        hole in one valve. Fig. 186 to 188.

        6. VULSELLA. Tongue-shaped, a ligamentary pit on the hinge. Fig.
        185.

        7. MULLERIA. Doubtful. Fig. 192.

    OSTRACEA. Bl. The first family of the order Lamellibranchiata, Bl.
    containing the genera Anomia, Placuna, Harpax, Ostrea (including
    Dendostrea, Sw.) Gryphæa. To these may be added Placunanomia, Brod. and
    Mulleria.

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Opening the text

A conchological manualSowerby, G. B. (George Brettingham)

Science

A conchological manual

Sowerby, G. B. (George Brettingham)

Mollusks -- Dictionaries; Shells -- Dictionaries

6. CONILITES. Like Belemnites, but external shell thin at the apex.
        Fig. 470.

    ORTHOCERATA. Bl. The first family of Polythalamacea, Bl. containing the
    genera Belemnites, Conularia, Conilites, Orthoceras and Baculites. De
    Blainville remarks that the genera included in this family are all
    fossils, and known very imperfectly, in consequence of the greater part
    of the specimens being only casts.

    ORTHOCERATITES. Auct. _Fam._ Orthocerata, Lam. and Bl.--_Descr._
    Straight, conical, divided into numerous chambers by simple septa
    perforated by a central siphon. O. annulata, fig. 464.

    OSTEODESMA. Desh. PERIPLOMA, Schum.

    OSTRACEA. (_Ostracées_, Lam.) A family belonging to the second section
    of the order Conchifera Monomyaria, the shells of which are described
    as irregular, foliaceous, sometimes papyraceous, with the ligament
    wholly or partly interior. The principal difference between the
    Ostracea and the Pectinides consists in the absence of the auricles and
    the foliated structure of the shells, for, although the Spondylus has
    ex-foliations or spines upon the external surface, the shell itself is
    compact and firm. This family contains the genera Gryphæa, Ostrea,
    Vulsella, Placuna, Anomia, which may be thus distinguished:--

        1. PEDUM. Flat, turned up at the sides, an hiatus for the passage
        of a byssus. A triangular disc on the hinge. Fig. 179.

        2. OSTREA. Foliaceous, irregular, hinge on a small triangular disc.
        Including Dendostrea, Ostræa, Exogyra, Gryphæa. Fig. 180 to 183.

        3. PLACUNA. Two diverging ribs near the umbones. Fig. 184.

        4. PLACUNANOMIA. The same, but attached by fibres passing through a
        hole in one valve. Fig. 189 to 191.

        5. ANOMIA. No costæ, attached by a bony substance passing through a
        hole in one valve. Fig. 186 to 188.

        6. VULSELLA. Tongue-shaped, a ligamentary pit on the hinge. Fig.
        185.

        7. MULLERIA. Doubtful. Fig. 192.

    OSTRACEA. Bl. The first family of the order Lamellibranchiata, Bl.
    containing the genera Anomia, Placuna, Harpax, Ostrea (including
    Dendostrea, Sw.) Gryphæa. To these may be added Placunanomia, Brod. and
    Mulleria.

Public-domain text, read in full here on John Shaqi.

A conchological manual

A conchological manual

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