File:Image from page 592 of "On the anatomy of vertebrates (electronic resource)" (1866) (14752453531).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: Scale of Eel: a, nat. size, and portionmagn. ccxcni* TEGUMENTS OF FISHES. 547 362

Text Appearing After Image: Cycloid scale, xxii. due to the presence of small round scales, about ^th in. diameter,with concentric and radiating lines: they are set deep in thederm. In the Sand-eel (Ammodytes), thescales are proportionally larger, and onemargin rises from the derm and pushes out-ward the portion of epiderm covering it: thedermal depression is limited to the oppositemargin, and is deeper than in the Eel. Thefree part of the scale retains the reticularstructure ; in the imbedded part the areolaare obliterated in the direction from the centreto the circumference ; the radiating lines preserve their distance,but, being united by cross fibres close set, the structure appearsto be laminated. The majority of flexible scales present thesame pattern of concentric and radiating lines: the concentriclines are the finest, most numerous, and constant; they repeatthe contour of the scale, and with most regularity at the anteriorimbedded and covered part, where growth chiefly takes place,the stages of which ar

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