File:Image from page 370 of "On the anatomy of vertebrates (electronic resource)" (1866) (14752397731).jpg

Identifier: b20416039_001 Title: On the anatomy of vertebrates [electronic resource] Year: 1866 (1860s) Authors: Owen, Richard, 1804-1892 Subjects: Anatomy, Comparative Vertebrates Fishes Reptiles Mammals Birds Publisher: London : Longmans, Green Contributing Library: Wellcome Library Digitizing Sponsor: Wellcome Library

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Text Appearing Before Image: .1Jacobson compares them to the whiskers in the Cat. Besides therostrum, these nervo-mucous organs are situated upon the sidesand under part of the head, and on the fore part of the trunk;they are crowded between the masseter, fig. 132, /, and thebranchial openings, ib. q, where they separate into two groups,one diverging downward, forward, and backward, to beneath thepectoral fin; the other directed upward, forward, and backward, tothe occiput. § 61. Organ of Touch in Hcematocrya. — In the Dermopteri,the Anguillidce, Siluroids, and a few other Fishes, with the in-tegument wholly or in part scaleless, or with very minute anddelicate scales, lubricated with mucus, the whole or major part ofthe external surface may be susceptible of impressions from thesurface of extraneous bodies coming in contact therewith. Butin the majority of the class the exercise of any faculty of touchmust be limited to the lips, to parts of certain fins, or to thespecially developed organs called 6 barboles.

Text Appearing After Image: 1 xx. vol. iii. p. 55, prep. no. 1395. 326 ANATOMY OF VERTEBRATES. Such an organisation of a fold of skin bordering the mouth asimplies the tactile faculty is rare in Fishes; the Cyprinoidsexemplify it, and more especially many of the Indian species :also the marine family of Labroids. In the Sturgeon the lip hasnumerous papillae, and more minute papillae occur on the lips ofmany fresh-water fishes. In the Eels the upper lip is richlysupplied by the fifth nerve, and the upper lip of the Lepidosirenis papillose. The soft skin of the sucking-lip of the Lamprey iswell supplied with a reticulate arrangement of sensitive filamentsfrom the fifth; its margin is papillose, fig. 277. The associatedpectoral and ventral fins, forming the sucker in the Lump-fishes,have a texture of the applied surface, which seems adapted toreceive impressions from the part it touches, whereby the fishmay ascertain its fitness or otherwise for the application of theanchoring organ. The pectoral fins seem to be ap

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