. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. Lamna Nasus PLATE XIII. branneri is more like C. riversi but in that form the serrations are stronger and the thickened root is still iess lunate. 28. Carcharodon leviathan Jordan and Hannibal, new species. Carcharodon branneri Jordan, Amer. Jour. Sci. Ill, 338, 1922. (Lomita, not of 1907). (Plate VII.; plate VIII.) Of this form we figure three examples, two of them (plate VII) from the Purple collection in the Los Angeles Academy from the Pleistocene at Lomita. These are more like C. megalodo
. Bulletin of the Southern California Academy of Sciences. Science; Natural history; Natural history. Lamna Nasus PLATE XIII. branneri is more like C. riversi but in that form the serrations are stronger and the thickened root is still iess lunate. 28. Carcharodon leviathan Jordan and Hannibal, new species. Carcharodon branneri Jordan, Amer. Jour. Sci. Ill, 338, 1922. (Lomita, not of 1907). (Plate VII.; plate VIII.) Of this form we figure three examples, two of them (plate VII) from the Purple collection in the Los Angeles Academy from the Pleistocene at Lomita. These are more like C. megalodon than C. branneri, and are perhaps the largest shark-teeth yet recorded. The two teeth are about equal in size and both somewhat broken. The largest has ihe crown, three inches in median height (60 mm. above the thickened base, its slant height six inches (110 mm.) the breadth at base about 60 mm., the very minute serrations not to be exactly counted, the number not less than 150. Crown set somewhat obliquely, the front face a little convex, nearly vertical. Tip blunt, rather more so than in C. megalodon or C. branneri. Serrations extremely small, scarcely perceptible, the side of the tooth forming a knife edge. Root broken in both examples, btit much thicker than in C. branneri, broader and more deeply lunate. We give this form a provisional name, though not quite certain what may be a final verdict as to the species of these huge fishes. The type is in the Los Angeles Academy of Sciences. The co-type is S. U. 1,000. Of a smaller bui perfect example, we have a photograph, (plate VIII), from an asphaltum deposit near Los Angeles; no details were given. As the living man-eater (Carcharodon carcharias) has teeth only about an inch long, with a total length of body 35 to 40 feet, the present form with teeth four inches long must have had a length in life of 125 to 150 feet, the mightiest of all leviathans. 29. Carcharodon arnoldi Jordan (Plate VI. .i. (type) I. f.; VI. j.) Carcha
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