in the recent improvement of the grade the main line has
been moved to the south.--H.F.O.]

[Footnote 22: A different interpretation of this contraction is given
upon p. 68.]

REFERENCES.

The published literature on this subject consists chiefly of technical
descriptions and researches scattered through the files of numerous
scientific journals in Europe and America. Only the more important
titles are cited in this list. I have also listed the recently
published text books which give the most authoritative treatment of
the dinosaurs, and two or three popular books dealing with fossil
vertebrates. Students consulting these authorities should remember
that great additions to scientific knowledge of dinosaurs have been
made during the last two decades, and much of the new evidence is as
yet unpublished or undigested. The views and conclusions presented in
this handbook are based upon the study of the American Museum
collections as well as upon the authorities cited below.

ABEL, OTHENIUS, 1912. _Palaeobiologie der Wirbelthiere._
Schweitzer-bart'sche Verlagsbuchh., Stuttgart.

BRANCA U. JANENSCH, 1914. _Wissenschaftliche Ergebnisse der
Tendaguru Expedition._ Archiv. f. Biontologie, iii Bd, i Heft.

BROWN, BARNUM, 1902-1914. Articles in Bulletin of Amer. Mus. Nat.
Hist., descriptive of new Cretaceous Dinosaurs.

CHAMBERLIN & SALISBURY, 1905-7. _Geology_, vol. i-iii. (Henry Holt &
Co. pub.)

COPE, E.D., 1868-1895. Articles in Hayden Survey Reports, American
Naturalist, Proceedings and Transactions of American
Philosophical Society and elsewhere, descriptive of various new
or little known dinosaurs.

DOLLO, L., _Sauriens de Bernissart_, etc. Numerous articles chiefly
in Bulletin Museum Royale Hist. Nat. Belg.

GILMORE, C.W., 1914. _Osteology of the Armored Dinosauria in the
U.S. National Museum with Special Reference to the Genus
Stegosaurus._ U.S. National Museum, Bulletin No. 89, pp. 1-136,
pll. i-xxxvii.

GILMORE, C.W., 1909. _Osteology of the Jurassic Reptile
Camptosaurus_ etc. Proc. U.S. Nat. Mus., vol. xxxvi, pp.
197-332, pl. vi-xx.

HATCHER, J.B., 1901. _Diplodocus (Marsh) its Osteology_, etc.
Memoirs of the Carnegie Museum, vol. i, pp. 1-63, pll. i-xiii.

HATCHER, J.B., 1903. _Osteology of Haplocanthosaurus._ Mem. Carn.
Mus., vol. ii, pp. 1-75, pll. i-vi.

HATCHER, MARSH & LULL,