. On the anatomy of vertebrates [electronic resource] . 84 ANATOMY OE 53 Ornithorhynchus, fig. 51, c; these fibres cover a greater antero-posterior extent of the macromyelon in the Echidna, and givethe pons a triangular form. In the Opossum the pons, fig. 53, b, is reduced almost to theproportions of that in the Ornithorhynchus ;the prepyramidai, tl, and olivary tracts aresimilar, and the latter are crossed by as well-marked a trapezoid arrangement of trans-verse fibres, c. The prepyramidai tracts come to the sur-face at a greater distance from the pons, inmost Mammals, than in M
. On the anatomy of vertebrates [electronic resource] . 84 ANATOMY OE 53 Ornithorhynchus, fig. 51, c; these fibres cover a greater antero-posterior extent of the macromyelon in the Echidna, and givethe pons a triangular form. In the Opossum the pons, fig. 53, b, is reduced almost to theproportions of that in the Ornithorhynchus ;the prepyramidai, tl, and olivary tracts aresimilar, and the latter are crossed by as well-marked a trapezoid arrangement of trans-verse fibres, c. The prepyramidai tracts come to the sur-face at a greater distance from the pons, inmost Mammals, than in Man, and thusresemble more the postpyramidal tracts;this character is shown in the Horse, , Dolphin, fig. 60, b, and Baboon, fig. the anthropoid Apes, the proportions ofthe prepyramids (fig. 112, Orang) approachthose in Man, and the arciform dispositionof the superficial layer of crossing fibres begins to prevail, andto allow the olives, which are likewise here more prominent,to come into view. Although the olives are less prominentin Belpliinus than in the Apes, they
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