. Bulletin. Natural history. 174 PEABODY MUSEUM BULLETIN 23 p. 102; 1897c, p. 110, pi. 13 fig. 3; 1897d, pi. 20 fig. 1; 1898a, p. 28; 1898b, pp. 102-134, 173, 175, pis. 16-18, pi. 19 fig. 1, pi. 31 figs. 1-3, pi. 60 figs. 1-2, pi. 61 figs. 1-2, pi. 72 fig. 3; 1902, p. 253; 1914, fig. 72c; 1925, p. 273, fig. 54. Osborn, 1899a, p. 169, figs. 1, 7, 8-9, 11-14, pis. 21-23; 1899b, p. 912. Furbringer, 1900, p. 616. Merril, 1907, p. 80. Sternberg, 1909, fig. 8; 1917, pp. 13, 162, fig. 5. Pompeckj, 1910, p. 137. Stromer, 1910, pi. 2. Dreverman, 1914, p. 43, fig. 7. Lambe, 1914, p. 402. Fejervary, 1918
. Bulletin. Natural history. 174 PEABODY MUSEUM BULLETIN 23 p. 102; 1897c, p. 110, pi. 13 fig. 3; 1897d, pi. 20 fig. 1; 1898a, p. 28; 1898b, pp. 102-134, 173, 175, pis. 16-18, pi. 19 fig. 1, pi. 31 figs. 1-3, pi. 60 figs. 1-2, pi. 61 figs. 1-2, pi. 72 fig. 3; 1902, p. 253; 1914, fig. 72c; 1925, p. 273, fig. 54. Osborn, 1899a, p. 169, figs. 1, 7, 8-9, 11-14, pis. 21-23; 1899b, p. 912. Furbringer, 1900, p. 616. Merril, 1907, p. 80. Sternberg, 1909, fig. 8; 1917, pp. 13, 162, fig. 5. Pompeckj, 1910, p. 137. Stromer, 1910, pi. 2. Dreverman, 1914, p. 43, fig. 7. Lambe, 1914, p. 402. Fejervary, 1918, fig. 25. Wiman, 1920, pi. 4 figs. 6a-b. Gilmore, 1921, p. 273. Lane, 1947, pp. 313-314, fig. 5. Romer, 1956, fig. 220. Kauffman and Kesling, 1960, fig. 6d. Referred Material. AMNH nos. **221, 1493, 1529, 1535, 1555, 1560, 1585, 1592, 2160, •*4909, **7220. YPM nos. *1268 (T. micromus), 1288, 1302, 1305, *3873, 3977, 3978, 3981, 3984, 3987, 3989, 3990, 3993, *3999, 4002 and about twenty-four unnumbered specimens. ANSP no. 5. USNM nos. 3776, 3794, 3798, 3897, **6086, *8S98, * 17909. MCZ no. **1030. KU nos. 1020, **1023, **1032, *1033, 1084, 1115, 1135, 1194, *5033. FHM no. **4 CNHM nos. UR820, **P15144, UR902. NMC no. 8162. PU no. 12000. Diagnosis. Anterior tip of premaxilla rectangular in lateral profile, in form of ellipse with vertical long axis in cross-section. Premaxillo-maxillary suture terminates posteriorly at point dorsal to or somewhat behind fourth maxillary tooth. Parietal foramen close to frontal suture. Lateral margin of prefrontal deeply grooved for anterior process of. Text-fig. 93. Dorsal view of parietal. A. Tylosaurus nepaeolicus (restored after AMNH 124 and YPM 3980, X ca. i/^). B. Tylosaurus proriger (slightly reconstructed, after YPM 3990, X ca. 1/2). postorbitofrontal. Posterior surface of parietal moderately to extensively invaded medially by insertional area for cer\'ical epaxial musculature. Infrastapedial process on quadrate small. Lateral crest of
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