| OCR Text |
Show 130 very shallow groove. First molar with triturating surface twice as long as wide, with an entering loop of enamel ou the inner side anteriorly narrower. Last molar as wide antero- posteriorly as transversely, the shaft curved backward, the posterior column sub- cylindric half the diameter of the anterior. Measurements, Inch. Diameter of middle moiarj ^ ^ t e^: : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : * » D i a m e t e r o f f l « t m o l « . . . J - t ^ £ jj Diameter of lart . n o U r . . . ^ ^ ^ ^ : : : : : ; : : : ; : : : : : ; ; " ; : : : ; : : : : ; : ; : : •* » Length of crown of last molar 250 This species is about the size of the northern hare. CATHARTES UMBROSUS, « p. nov. Represented by numerous portions of nearly all parts of the skeleton, in excellent preservation. The beak from the frontal bone to near the apex is preserved ; it displays the depression just anterior to the nares, which marks the anterior boundary of the cere. The culmen is nearly horizontal to just beyoud this mark, and then exhibits a gradual decurvature to the apex. The beak is strongly compressed, and the tomia strongly decurved, forming an open festoon, whose middle point marks one- fourth the length of the beak from the nares. The latter are directed obliquely downward and forward, narrowing anteriorly and having a prominent inferior boundiog ledge. The mandible is weak, the symphisis- marking on half the length of the beak from the anterior angle of the nares. The bones of the anterior extremities exhibit large and powerful proportions, as compared with the posterior, appropriately to capacity for sustained flight. The head of tne humerus is much compressed, and the articular face is nearly divided into two by the deep bicipital groove. The head of the femur is small, and the rotular face a wide and deep groove. The tibia is slender, the shaft much compressed, with a prominent ridge. The cnemial crest is short, and not produced downward on the shaft. The distal posterior bridge is narrow and oblique. The tarso- metatarsus has a strong exterior crest, which constitutes half the width of the shaft. Measurements. Inch. Length of beak from base of culmen, ( axial) 1.90 Length of beak from cere to apex, ( axial) 1.20 Depth of beak at culmen 87 Depth of premaxillary at festoon ^ 75 Leugth of symphysis -. 69 Length of nares 37 Width of palate at festoon 50 Width of head of humerus 1.37 Width of condyles 1.13 Width of distal end of femur 94 Width of head of tibia 81 Width of condyles of tibia 66 Width of condyles of tarso- metatarsus 75 Length of a firet phalanx 1.12 Length of seven sacral vertebrae 1.87 Length of two dorsal vertebra 1.12 Depth of a dorsal vertebra, ( total) 93 Depth of a dorsal vertebra to roof of arch 44 Depth of centrum of roof of arch 25 Width of centrum of roof of arch 32 Leugth of two cervical vertebra* 1.12 Depth of two cervical vertebrae to apex of neural spine 44 Depth of articular face of centrum 17 Width of articular face of centrum 25 o |
