OSTEOLOGY OF CAENIVOROUS DINOSAURS. 



9 



In 1903 Osborn ' described and figured cranial material, identified as pertain- 

 ing to the genus Creosaurus, but subsequently - referred by liim to AUosauriis. 

 (See fig. 3.) There are two skulls in the American Museum of Natural History, 

 New York, from the famous "Bone Cabin Quarry," in Wyoming, both of which are 

 considerably larger that the specimen now before me, as is shown by the table of 

 comparative measurements given below. 



orb. rug: 



—f- 



N0.S027 

 AM 



FlG.2.— Skull AND LOWER JAW OF TVEANNOSAURUS REX OsBOKN. Xo. .5027, A.M.N. H. J NAT. SIZE, an^, Ai^GVL\R; ant.f: am. 

 f"; anl.f,'" aniioebital fenesteae; ant.nar, anterior kares; arl, articular; den, dentary; j.f, jugal foeamen; ja, jugal ; 

 la, lachrymal; lat.Ump.fcn, lateral temporal fenestra; ttii, maxillary; na, nasal; OTb, orbit; orft.rw^, orbitalrugo- 

 sity; op.o, paraoccipital; pa, parietal; p.o, postoreital+postfrontal; pr.mi, premaxillaey; qii, quadrate; git.j, 



QUADRAIOJUGAL; 5}, SQUAMpSAL; SUT, SURANGULAE; * FORAMEN. (AFTER OSBORN.) 



Comparative measuTenunts of Antrodemus crania. 



Length, occipital condyle to end of premaxillary 



Depth, parietal crest to distal extremity of quadrate 



Width of occiput across parietals 



Vertical measurement of quadrate 



U.S.N.M. 

 No. 4734. 



771771. 



605 

 355 

 153 

 190 



A.M.N.H. 

 No. 600. 



771777. 



810 

 415 



A.M.N.H. 

 No. 666. 



205 



885 

 430 

 230 

 235 



1 Osborn, H. F. The Skull of Creosauras, Bull. Amer. Mus. \at. Hist., vol. 19, 1903, pp. 697-701, figs. 1 and 2. 



2 Crania of Tyrannosauras and AUosaurus, Memoirs Amer. Mus. of Nat. Hist., vol. 1, new ser. pt. 1, 1912, pp. 27, 29, figs. 26, 27. 



