. An introduction to the study of mammals living and extinct. Mammals. DELPHINIDM 263 American coast as the river St. Lawrence, which it ascends for a considerable distance. On rare occasions it has been seen on the coast of Scotland. Eemains of a Cetacean from the Lower Pliocene of Tuscany have been referred by Brandt to this genus under the name D. hrocchii In all the remaining genera of Delphinidce the cervical region of the vertebral column is very short, and the first two, and usually more, of the vertebrae are firmly united. Phoccena}âTeeth ff, small, occupying nearly the whole length of
. An introduction to the study of mammals living and extinct. Mammals. DELPHINIDM 263 American coast as the river St. Lawrence, which it ascends for a considerable distance. On rare occasions it has been seen on the coast of Scotland. Eemains of a Cetacean from the Lower Pliocene of Tuscany have been referred by Brandt to this genus under the name D. hrocchii In all the remaining genera of Delphinidce the cervical region of the vertebral column is very short, and the first two, and usually more, of the vertebrae are firmly united. Phoccena}âTeeth ff, small, occupying nearly the whole length of the rostrum, with compressed, spade-shaped crowns, separated from the root by a constricted neck (Fig. 92). Eostrum rather shorter than the cranium proper, broad at the base and tapering towards the apex. Premaxillse raised into tuber- osities in front of the nares. The frontal bones forming a _ââ_,, ,_ _ . ^ , â ° Fig. 92.âTeeth of Porpoise. Twice natural size. somewhat square, elevated pro- tuberance in the middle line of the skull behind the nares, rising altogether above the flattened nasals. Pterygoids very small, and widely separated in the middle line. Symphysis of mandible very short. Vertebrae : 0 7, D 13, L 14, C 31; total 65 (subject to slight individual variations). First to sixth cervical vertebrse, and sometimes the seventh also, coalesced. Manus of moderate size, oval, slightly falcate; second and third digits nearly equal in length; fourth and fifth well developed, but shorter. Dorsal fin near the middle of the back, triangular; its height considerably less than the length of the base; its anterior edge frequently furnished with one or more rows of conical horny tubercles. The common Porpoise (Fig. 93), P. communis, is the best known of British Cetaceans. The word Porpoise (sometimes spelled Porpus and Porpesse) is apparently derived from the French pore and poissoti, or the Italian porco and pesce, and thus corresponds with some of the English vernacul
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Keywords: ., bookauthorly, bookcentury1800, bookdecade1890, booksubjectmammals
