. Fig 42.—Dentary bone ol' Xanosaiirus agilis JIarsb ; seeu from the left. Fig. 43.—Ilium of same individual; leftside. Botli figures are natural size Fig. 44.—Left femur of Nanosaurus rex Marsh; front view. Fig. 45 —Proximal end of same. Fig. 46.—The same bone; side view. Fig. 47.—The same; back view. Fig. 48.—Distal end of same. All five figures are one-half natural size. the larger forms. The posterior eud is also of moderate size. All the bones of the limbs and feet are extremely hollow, strongly resembling in this respect those of birds. The femur was shorter than the tibia. The metatarsa

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. Fig 42.—Dentary bone ol' Xanosaiirus agilis JIarsb ; seeu from the left. Fig. 43.—Ilium of same individual; leftside. Botli figures are natural size Fig. 44.—Left femur of Nanosaurus rex Marsh; front view. Fig. 45 —Proximal end of same. Fig. 46.—The same bone; side view. Fig. 47.—The same; back view. Fig. 48.—Distal end of same. All five figures are one-half natural size. the larger forms. The posterior eud is also of moderate size. All the bones of the limbs and feet are extremely hollow, strongly resembling in this respect those of birds. The femur was shorter than the tibia. The metatarsals are greatly elongated and very slender, and there were probably but three functional toes in the hind foot. A second form referred by the writer to this genus, under the name Nanosai rus rex, may perhaps belong to the genus Laosaurus. The femur is shown in figs. 44 to 48, above. The animal thus represented

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Keywords: ., bookcentury1800, bookdecade1890, bookpublisherwashi, bookyear1896