. Bulletin. Natural history. RUSSELL: AMERICAN MOSASAURS 133 dentary, splenial, angular, coronoid, articular, squamosal, twelve vertebrae, scapula, coracoid, humerus and pectoral limb elements. Type of Mosasaurus lemonnieri in the Musee Royal d'Histoire Naturelle de Belgique, from ". . Mesvin, localite situee a 4 kil. 5 de Mons," Belgium (Dollo, 1889b, p. 273). Type specimen includes a skull and anterior cervical vertebrae (ibid., p. 274). Distribution. ?Taylor Marl, Texas; Marlbrook Marl, Arkansas; Verendrye Member, Lower Pierre Formation, Virgin Creek Member, Upper Pierre Formation
. Bulletin. Natural history. RUSSELL: AMERICAN MOSASAURS 133 dentary, splenial, angular, coronoid, articular, squamosal, twelve vertebrae, scapula, coracoid, humerus and pectoral limb elements. Type of Mosasaurus lemonnieri in the Musee Royal d'Histoire Naturelle de Belgique, from ". . Mesvin, localite situee a 4 kil. 5 de Mons," Belgium (Dollo, 1889b, p. 273). Type specimen includes a skull and anterior cervical vertebrae (ibid., p. 274). Distribution. ?Taylor Marl, Texas; Marlbrook Marl, Arkansas; Verendrye Member, Lower Pierre Formation, Virgin Creek Member, Upper Pierre Formation, South Dakota; Navesink and younger Cretaceous, New Jersey; ?Craie brune phosphatee de Ciply, Belgium. Additional References. Martin, 1953, pp. 1-62. l\Iiller, 1955, p. 909. Referred Material, AMNH nos. 1387, ?1395, 1397. YPM nos. ?379, ?1500, 1510, 1573. ANSP nos. 8469, 8480, 8501, 8502, ?8504, ?8509. USNM nos. 11596, 11904, 18255. SDSM no. 452. Diagnosis. Tuberosity present(?) below stapedial pit on lower medial body of quadrate; suprastapedial and infrastapedial process small in lateral profile. Ventral wing of coronoid well developed on medial surface of lower jaw. Dentary very slender, as in Clidastes, dorsal and ventral margins converge gradually anteriorly, element comes to rounded tip anterior to first dentary tooth. Fifteen teeth in maxilla, seventeen teeth in. Text-fig. 77. Type dentary of Mosasaurus conodoti (AMNH 1380. X Y^). dentary and ten teeth in pterygoid. Marginal teeth slenderer than in M. missouriensis, M. maximus and M. ivoensis, tips posteriorly recurved. External facets narrow and more numerous than in AI. maximus (Cranial diagnosis based on Dollo, 1889b, pis. 9-10; 1924, p. 181). Vertebral formula: 45 presacral vertebrae, 8 pygals, 21 caudals with chevrons and transverse processes, about 54 terminal caudals. Articulating surfaces of cervical and anterior dorsal centra wider than deep, smoothly elliptical in outline; posterior dorsals become circular, th
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