File:Image from page 119 of "Guide to the Crustacea, Arachnida, Onychophora and Myriopoda exhibited in the Department of Zoology, British Museum (Natural History) .." (1910).jpg

English: Identifier: guidetocrustacea00brit

Title: Guide to the Crustacea, Arachnida, Onychophora and Myriopoda exhibited in the Department of Zoology, British Museum (Natural History) .. Year: 1910 (1910s) Authors: British Museum (Natural History). Dept. of Zoology Calman, William Thomas, 1871- Hirst, A. S Bell, F. J. (Francis Jeffrey), 1855-1924 Subjects: Crustacea Arachnida Onychophora Myriapoda Publisher: London : Printed by order of the Trustees Contributing Library: Smithsonian Libraries Digitizing Sponsor: Smithsonian Libraries

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Text Appearing Before Image: Fig. 7J. JJccolopoda australif;, a teu-legged Pycuogonid from the Antarctic Seas. Slightly .reduced. [Table-case No. 26.J Pcutastoniida. 117 APPENDIX TO AEACHNIDA. PENTASTOMIDA. The Pentastomida, or Linf^uatulida, represented in Wall- Wall-Ccase case 7 by Pcntastomum arviiUatam from an African python,and Linguatuhi lacniuitlcs from the nose of the dog, are alwaysparasitic, and have been so much modified by this habit thatthere is little left to show their affinity to tlie Arachnida. Thesegmentation of the body, and the hooks on either side of themouth, are the sole external indications of their relationships.The third preparation, showing the young in the visceral mem-liranes of a mannnal, forms an interesting link in the life-history No.

Text Appearing After Image: Fig. 80.Pentastomnvi armilUttiim. (Natural size.) of these creatures; it appears that the python gets its lun^^-parasite from eating a small mammal; the parasite becomessexually mature in the lung of its new host, and the eggs fromthe lung are coughed out, and aie taken up by the mammal,when in search of food. The external ringing of the body does not correspond with anyinternal segmentation; the characteristic hooks are capable ofprotrusion and retraction; the only sense-organs are some pairedpapillae on the head; the sexes are separate, and the eggs areconsiderably developed before they are laid. 118 Gilidc ■ to Ou)chophora. Class 4.—ONYCHOPHORA. Wall-case This division of the Animal kingdom is represented by a numberon VlO) ^^ forms closely resembling one another in appearance and habits,and for a long time known by the general name of Peripattis. Inrecent years the differences between them have been accentuatedby systematists. Examples are shown of Peripatus from Jamaica,of Pc

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