. The Cambridge natural history. Zoology. XVII ELASMOBRANCHII SELACHII 453 become extinct is proved by the fact that similar teeth have been dredged from the bottom of the Pacific. Teeth and detached vertebrae from various Tertiary deposits have been referred to species of Alopecias. Entire Fishes, with an elongated rostrum and an extensive anal fin, from the Cretaceous of Mount Lebanon, have been assigned to an extinct genus, Scapanorhi/nchus. Fam. 11. Cetorhinidae (Basking Sharks).—Two dorsal fins, without spines, the anterior midway between the pectoral and pelvic fins. Tail without lateral
. The Cambridge natural history. Zoology. XVII ELASMOBRANCHII SELACHII 453 become extinct is proved by the fact that similar teeth have been dredged from the bottom of the Pacific. Teeth and detached vertebrae from various Tertiary deposits have been referred to species of Alopecias. Entire Fishes, with an elongated rostrum and an extensive anal fin, from the Cretaceous of Mount Lebanon, have been assigned to an extinct genus, Scapanorhi/nchus. Fam. 11. Cetorhinidae (Basking Sharks).—Two dorsal fins, without spines, the anterior midway between the pectoral and pelvic fins. Tail without lateral keels. Nictitating membranes absent. Spiracles small, situated just above the angles of the mouth. Branchial clefts wide and of great vertical extent, extending from the dorsal to the ventral surface. Teeth small, very numerous, conical in shape, without serrations. Claspers of the male provided with horn-hke denticles. The single species included in this family, the Basking Shark, (Getorhinus (Selache) viaximus),is-XTie of the largest of living Fishes, reaching a length of 4i^eet (Fig. 259). It is a pelagic. Fig. 259. —The Basking Shark ( (Sdache) maximus). (From Goode and Bean.) Shark, inhabiting the Arctic seas, but wandering as far south on opposite sides of the Atlantic as the Mediterranean, the coasts of Portugal and Virginia, and in the Pacific to the Californian coast.° Although generally described as a northern form, Geto- rhinus is known to occur in Australian waters.^ It is fairly common off the coasts of Scotland, and it has been seen or captured at various points on the western coast of Ireland, and 1 Kershaw, Victorian Natural, xix. 1901, p. 62 ; Waite, Bee. Austral. Mus. iv. 1901, p. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harmer, S. F. (Sidney Frederic), Sir, 18
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
