File:Image from page 319 of "On the anatomy of vertebrates (electronic resource)" (1866) (14752378971).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: ,1and in the almost finless Lepidosiren,2 fig. 186,C: it attains its highest developement, in thepresent class, in the Sharks, where it not onlycovers the fourth ventricle, but advances overthe optic lobes, and in the Saw-fish extendsbeyond them to rest upon the cerebrum; itssurface is further extended in these activepredaceous fishes by numerous transversefolds, fig. 187, c. Inmost Osseous Fishes thecerebellum is a smooth convex body, hemispheroid, fig. 175, C, ortransversely subelliptic (Eel, fig. 176, c), or longitudinally subel-liptic (Lepidosteus), fig. 174, c ; but it may be an oblong body(Diodon), fig. 171, C, or be depressed and tongue-shaped (Cod,fig. 183,/), or oval, or pyramidal (Perch, fig. 182, a) ; it is veryrarely found extending forward, as in Echeneis and Amblyopsis, fig.175, c, over any part of the optic lobes ; but often backwardover the whole fourth ventricle, as in the Cod, fig. 183,/, and theDiodon, fig. 171, C ; or over the major part of the ventricle, as in the

Text Appearing After Image: Brain; Sturgeon, cxcix. 1 xxv. p. 24, pi. ii. figs. 5, 7. xxxiii. p. 339, pi. 27. ENCEPHALON OE FISHES. 275 Herring, fig. 184, C; but sometimes covering only a small portion, asin the Chub, fig. 177, c, the Lump-fish, and the Lepidosteus, fig.174, c. The relative size of the cerebellum, accordingly, varies 174 175 176

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