A manual of palaeontology for the use of students : with a general introduction on the principles of palaeontology / by Henry Alleyne Nicholson and Richard Lydekker.

Date:
1889
Catalogue details

Licence: Public Domain Mark

Credit: A manual of palaeontology for the use of students : with a general introduction on the principles of palaeontology / by Henry Alleyne Nicholson and Richard Lydekker. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

    903/1688 (page 881)
    4 OCTOPODA. 881 more or less feather-shaped, and consists of a central shaft bordered by lateral wings. In some cases, as in Leptoteuthis and Plesioteuthis, the actual impression of the body of the animal is preserved, and from such examples it is known that the arms were not furnished with horny hooks. Sub-Order II. Octopoda. The forms included in this section of the Dibranchiates are char- acterised by the possession of eight equal arms, the internal skeleton being rudimentary or absent. The suckers of the arms may be modified into horny booklets. In the female of the Paper Nautilus {Argonai(ia) the two dorsal arms are widely expanded, and secrete a delicate calcareous external shell, which is not connected by muscles with the body of the animal. The shell of the female Ar- gonaut is one-chambered, spirally coiled and involute, its external border being keeled, and its surface tuberculated. The genus is represented in the Pliocene Tertiary by one or two species, and several living forms are known. According to von Zittel, the genus Acanthoteuthts is founded upon the remains of an Octopod Cuttle-fish preserved in the fine-grained Lithographic Limestone (Jurassic) of Solenhofen, and showing the form of the body and the outline of the arms, the latter carrying each two rows of falciform horny hooks. LITERATURE OF MOLLUSCA. General. 1. Manuel de Conchyliologie et de Paldontologie Conchyliologique. Paul Fischer. 1887. 2. Handbuch der Palaeontologie. Bd. I. Abth. 2, Lief. 1-3. 1881-84. Von Zittel. 3. Manual of the Mollusca. S. P. Woodward. 4th ed., with Ap- pendix of Recent and Fossil Conchological Discoveries, by Ralph Tate. 1880. 4. Handbuch der Conchyliologie. Philippi. 1853. 5- Malacozoa. In ' Bronn's Klassen und Ordnungen des Thier- Reichs.' 1862-66. Keferstein. 6. Traits dldmentaire de Conchyliologie. 1835-39. Deshayes. 7. The Genera of Recent Mollusca. 1858. H. and A. Adams. 8. Mineral Conchology of Great Britain. 1812-30. J. Sowerby. Lamellibranchiata. [Apart from the general works above quoted, the following are some of the more important sources of original information, with more especial reference to the fossil forms.] 9. On the Microscopic Structure of Shells. ' Reports of the British Association.' 1844 and 1847. W. B. Carpenter.