248 



PROCEEDINGS^ OF THE NATIONAL MUSEUM. 



VOL. XXXVI. 



On the median internal surface near the border of the articular 

 end for the coracoid is a narrow, longitudinal groove which passes 

 outward diagonally to meet the foraminal notch in the coracoid. 



Fig. 23. — Left scapula op Camptosaurus browni. Holotvpe. Cat. No. 4282, U.S.N.M. ; 



I NAT. SIZE ; VIEWED EXTER^'ALLY ; C, SI'RFACE FOR CORACOID ; f/, GLENOID CAVITY. FROM 

 A PHOTOGKAPH. 



This groove is present on all of the scapulae studied, and, so far as 

 I am aware, is only found in the Dinosauria among the members of 

 the Camptosauridse and the Laosauridse. 



Measurements of Specimen Cat. No. .'f282, U.S.N.M. 



mm. 



Greatest length of left scapula and coi-acoid 595 



Greatest length of scapula 482 



Greatest breadth of scapula 175 



Least breadth of scapula 03 



Greatest expanse of glenoid cavity S.3 



The roraroid. — The coracoid is a small subrectangular bone, with 

 the anterior and inferior borders turned inward, forming a moder- 

 atelj" deep concave internal surface both 

 antero-posteriorly and vertically. Externally 

 ,, i the surface is convex in l)otli directions. 

 (*' . ' There is a broad notch on the inferior border. 



Anterior to this notch the border is thickened 

 ^ \ - '-\ on the antero-infero angle, the siu"face being 



^■i roughened, more especially the internal, and is 

 ' ■ ^ thus indicative of the presence of cartilagi- 

 nous attachment of sternal elements. The 

 border posterior to the notch is especially 



Fig. 24. — Left coracoiu ,i • i i i i. i-i • i 



OF camptosauris thickened and represents the coracoid com- 



BRowNi. noLOTYPE. poneiit of the glenoid fossa (see r, fig. 24). 



Cat. No. 4282, U.S.N.M. ; i^ ... *" , . ,^ r. , 



\ NAT. SIZE. External The interior suiooth articular part oi the 

 ':Z\%o:::^Tor:i posterior border is separated from the rugose 

 TicuLATioN WITH scAp- surfacc for union Avith the scapula by a deep, 



ULA ; C. BORDER OF GLEN- /. • , , , 1-1 • T • 1 1 



oiD CAVITY. From .1 loraminal notch, which on some individuals 

 piioTOGRAPn. ig nearly closed. This notch passes through 



diagonally, emerging on the postero-internal border, as in Iguanodon. 



In none of the specimens examined did it exist as a well-defined 



