Lower dentition, height of mandible under m. 1 66 mm. 56 mm. Incisor 1, length 8 mm. 8 mm. Incisor 2, length 10 mm. 10 mm. Incisor 3, length 23 mm. 13 mm. Canine, length 8 mm. 9 mm. Premolar 1, length 13 mm. 8 mm. Premolar 1, width 12 mm. 12 mm. Premolar 2, length 18 mm. 16 mm. Premolar 2, width 17 mm. 15 mm. Premolar 3, length 21 mm. 18 mm. Premolar 3, width 19 mm. 16 mm. Premolar 4, length 24 mm. 21 mm. Premolar 4, width 19 mm. 18 mm. Molar 1, length 33 mm. 27 mm. Molar 1, width 20 mm. 20 mm. Molar 2, length 40 mm. 37 mm. Molar 2, width 20 mm. 20 mm. Molar 3, length 57 mm. 57 mm. Molar 3, width 20 mm. 20 mm. [Illustration: Fig. 72. Top view of skull of L. gaudryi (female)—¼ natural size.] In the skulls there is considerable variation in size in the different individuals, but the proportions remain very much the same throughout. In the female the snout is relatively a little shorter, and in general the female skulls are from 5 to 10 per cent. smaller throughout. The following two sets of figures illustrate the comparative sizes of the two sexes. [Illustration: Fig. 73. L. gaudryi, view of case of the skull, female (L. oxyhynea)—¼ natural size; Tympanic bullae broken open.] SPECIMEN SPECIMEN 3335 3291X MALE FEMALE Skull, greatest length front to back 420 mm. 392 mm. Skull, greatest width 252 mm. 236 mm. Skull, length of nasal bone 115 mm. 102 mm. Skull, length of palate 235 mm. 230 mm. The atlas associated with skull No. 3335 is a decidedly heavy bone in all its proportions. The axis and the third cervical were associated with skull No. 3291x, and are likewise heavy bones. The following are typical measurements: