. Synopsis of the extinct Batrachia, Reptilia and Aves of North America . e of shaft, 3. These humeri are relatively shorter than in Hadrosaurusand Iguanodon, and the external alse do not pass so abruptlyinto the shaft as in them. They resemble most those of Poeci-lopleurum. They differ from these in being much dilated dis-tally, especially internally, and in having the coronoid fossamuch more pronounced. l&re-ttmb.—In the lack of the necessary pieces, one can-not go far wrong in estimating the length after that of Poe-cilopleurum. In it the lower arm is three-fifths the humeru
. Synopsis of the extinct Batrachia, Reptilia and Aves of North America . e of shaft, 3. These humeri are relatively shorter than in Hadrosaurusand Iguanodon, and the external alse do not pass so abruptlyinto the shaft as in them. They resemble most those of Poeci-lopleurum. They differ from these in being much dilated dis-tally, especially internally, and in having the coronoid fossamuch more pronounced. l&re-ttmb.—In the lack of the necessary pieces, one can-not go far wrong in estimating the length after that of Poe-cilopleurum. In it the lower arm is three-fifths the humerus,which gives for Laelaps a length of in. to the wrist. Ifwe accept the Crocodile as the next nearest ally in the fore-limbs, we find the carpus and hand to be .75 of the ungueal phalange preserved in Poecilopleurum is shorterthan in the Crocodile; if however we add 9 inches to thelength already estimated, we have for the whole 2 ft. 4-2inches. This is, as will be hereafter shown, a little more than onefourth () the length of the hind 104 THE EXTINCT BATRACHIA, KEPTILIA Left Femur.—The bead and summit of the great trochanter, and the posterior portions of the condyles, are brokenaway. The shaft is rather slender, and is strongly arched forwards and slightly outwards. The third trochanter ison the posterior face, is turned inwards, and marks one-third the length of the shaft from the supposed position ofthe head. Just below it the shaft is cyclo-trigonal, while for a short distance above the condyles it is flattened ante-roposteriorly. It is strongly concave between the condyloid ridges at the distal end. At this place the external faceis convex, the internal concave as high as a point a little more than a fourth the total length. The concavity is sepa-rated from the anterior face by a strong ridge which is partly broken away. The anterior surface is turned posteriorlyto the external condyle, while it is concave and turned forwards to the intern
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