. Bulletin of the Department of Geology. Geology. Vol. 5] Miller.—Wading Birds of Rancho La Brea. 447 Distal trochlear region much less flattened. This character is most clearly shown by a comparison of dimensions given in the table below. The ratio of the greatest transverse diameters in the two species is 100:62, while the ratio of the greatest sagittal diameters is 100:83; or again, the ratio of sagittal to transverse diameters is 100:95 in G. minor as against 100:74 in G. cana- de nsis. The entocondyle as seen from the front is proportionately smaller. Its ratio to the ecto- condyle is 100
. Bulletin of the Department of Geology. Geology. Vol. 5] Miller.—Wading Birds of Rancho La Brea. 447 Distal trochlear region much less flattened. This character is most clearly shown by a comparison of dimensions given in the table below. The ratio of the greatest transverse diameters in the two species is 100:62, while the ratio of the greatest sagittal diameters is 100:83; or again, the ratio of sagittal to transverse diameters is 100:95 in G. minor as against 100:74 in G. cana- de nsis. The entocondyle as seen from the front is proportionately smaller. Its ratio to the ecto- condyle is 100 :65 in G. minor, as against 100 :80 in G. canadensis. Other differences not easily measured are noticeable in the intercondylar tubercle, which is less produced and has its summit less knob- shaped. The supratendinal bridge is narrower and is not crossed obliquely from within by a distinct ridge. The region of attachment of the outer end of the tendinous bridge is less flattened. The generic characters of Orus are well dis- played in the inequal condyles and the wide in- tercondylar gorge marked near the middle by a secondary transverse depression; the depressed osseous bridge with its prominent tubercle; the deep extensor groove, rounded where it plunges under the osseous bridge, but flattened to a sharp- lipped slit where it emerges again distally. In the type specimen the crests and ridges Fig. 8. are sharply defined and the texture of the bone ' em\ 0f' tibio- is such as to leave no doubt but that it is part tarsus from an- terior side, nat- of an adult individual. nral Table of Measurements. Tibia, no. 12533. Greatest transverse diameter through condyles mm. Greatest sagittal diameter through condyles Depth of anterior aspect of ectocondyle Depth of anterior aspect of entocondyle Least transverse diameter of shaft Least sagittal diameter of shaft Width of osseous bridge Please note that these images are extracted from scanned page
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