File:The osteology of the trachodont dinosaur Kritosaurus Incurvimanus (1920) (14764161492).jpg

Identifier: cu31924004594895 (find matches)
Title: The osteology of the trachodont dinosaur Kritosaurus Incurvimanus
Year: 1920 (1920s)
Authors: Parks, W. A. (William Arthur), 1868-1936
Subjects: Kritosaurus incurvimanus
Publisher: (Toronto) The University library: pub. by the librarian
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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ened externally; theplanes of flattening arenot parallel but inclinedtowards each other pos-teriorly. The articularsurface of the inner con-dyle is sub-rhomboidalin outline and that of theouter sub-triangular. Above the constrictedshaft the bone expandsin two directions; antero-extemally into the veryprominent radial crestwhich continues upwardsinto the outer tuberosity,and posteriorly into aridge, obliquely trans-verse to the above, whichcontinues upwards intothe inner tuberosity. Onthe anterior face thesetwo expansions are separ-ated by a slightly concavearea and on the posteriorface by an intermediateconvexity which rapidlyexpands into the promin-ent head. A proximal view shows the outer tuberosity as the lightestelement, inclined slightly backwards and separated by a slightconcavity from the head, which is robust and posteriorlysituated. The inner tuberosity is intermediate in size be-tween the head and the outer tuberosity and is not separatedfrom the head by a marked depression.
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FIG. 9—Left humerus; A, inner front view; B, outer rear view. One eighth natural size. h, head; oc. outer condyle; ic, inner condyle; r, radial crest; it, inner tuberosity; ot, outer tuberosity. 36 KklTOSAURUS INCURVIMANUS VS m I Ml The humerus in this species is longer than in Trachodonmirabilis, Claosaurus annectens, Saurolophus, or Hypacro-saurus; it is shorter than that of Lambes Stephanosaurusmarginatas. The radius and ulna (Figs. 10, n, and 12) show no strikingfeatures to distinguish them from the similar bones of othertrachodonts. The relative length of these bones with respectto that of the humerus is regarded as a feature of genericvalue. In Kritosaurus, the ulna, over the olecranon process,is slightly shorter than the humerus and theradius is considerably shorter. This relation-ship is observed in Trachodon andHadrosaurus,while in Saurolophus the bones are of equallength, and in Hypacrosaurus the radius ismuch the longer bone. The bones of the two sides agree closelyin det

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