NO. 1G66. 



OSTEOLOGY OF VA.Ul'TOSA UliUti—GlLHOli]]. 



249 



foramen, as found in other members of the Dinosauria and as indi- 

 cated b}^ Marsh in his ilhistrations of this element. The superior 

 border presents a thin, sharp ed^e, while the anterior is more rounded 

 and roujrhened. with a thickened portion at the antero-supero anole. 



Measuycnuiitfi of KiKciincii Cut. A o. ).i,S^, U.ti.S.AL 



mm. 



(ireatest leiif,'tli of left foracoid _ 115 



(ireatest widtjj of left coracoirt-- 15(i 



TIIK H)l!i: I.IMI:. 



The humerus. — The humerus is comparalivel}- short, being- some- 

 what expanded at both extremities, more especially the proximal. 



Fig. 25. — Left humerus of CAMPTOSAunus 



BROWNI. IIOLOTYPE. ("AT. NO. 4282, 



U.S.N.M. ; 4 NAT. SIZE. Fuont view, d, 



DELTOID CKEST. FRO.\r A niOTOClRAPII. 



Fig. 26. — Left humerus of Camptosaurus 

 browni. iiolotypk. c.vt. no. 4282, 

 U.S.N.M. ; \ NAT. SIZE. Back view. /;, 

 HEAD. From a photograph. 



The head is situated in about the middle of the proximal end and is 

 produced considerably backward beyond the posterior border of the 

 shaft (see ^, fig. 26). It has a smooth, subspherical, articular sur- 

 face from which a ridge-like sw^elling passes down into the posterior 

 surface of the shaft. There is a heavy radial crest developed on 

 the antero-external border just above the middle of the shaft which 

 renders the anterior asi^ect of the surface concave. The crest (see <:?, 

 fig. 25) appears to occupy a lower position on the shaft than it does 



