fs, Wyoming. In 1899-1900
large parts of two skeletons of another species, in a remarkable state
of preservation, were disinterred by Messrs J. L. Wortman, O. A.
Peterson and J. B. Hatcher in Sheep Creek, Albany county, Wyo., and
these are now exhibited with minor discoveries in the Carnegie Museum,
Pittsburg. There are also other specimens in New York, Chicago and the
University of Wyoming. In 1901 Mr J. B. Hatcher studied the new species
at Pittsburg, named it _Diplodocus carnegii_, and published the first
restored sketch of a complete skeleton. Shortly afterwards plaster casts
of the finest specimens were prepared under the direction of Mr J. B.
Hatcher and Dr W. J. Holland, and these were skilfully combined to form
the cast of a completely reconstructed skeleton, which was presented to
the British Museum by Andrew Carnegie in 1905. This reconstruction is
based primarily on a well-preserved chain of vertebrae, extending from
the second cervical to the twelfth caudal, associated with the ribs,
pelvis and several limb-bones. The tail is completed from two other
specimens in the Carnegie Museum, having caudals 13 to 36 and 37 to 73
respectively in apparently unbroken series. Prof. Marsh's specimen in
Washington supplied the greater part of the skull; and the fore-foot is
copied from a specimen in New York.

[Illustration: Reconstructed Skeleton of _Diplodocus carnegii_, Hatcher,
about one-hundredth natural size. A and B, Caudal Vertebrae Nos. 36 and
70 of the same are about one-quarter natural size.]

The cast of the reconstructed skeleton of _Diplodocus carnegii_ measures
84 ft. in length and 12 ft. 9 in. in maximum height at the hind-limbs.
It displays the elongated neck and tail and the relatively small head so
characteristic of the Sauropodous Dinosaurs. The skull is inclined to
the axis of the neck, denoting a browsing animal; while the feeble blunt
teeth and flat expanded snout suggest feeding among succulent
water-weeds. The large narial opening at the highest point of the head
probably indicates an aquatic mode of life, and there seems to have been
a soft valve to close the nostrils when under water. The diminutive
brain-cavity, scarcely large enough to contain a walnut, is noteworthy.
There are 104 vertebrae, namely, 15 in the neck, 11 in the back, 5 in
the sacrum and 73 in the tail. The presacral vertebrae are of remarkably
light construction, the plates and struts of bone being arranged to give
the greatest