GILMORE: OSTEOLOGY OF BAPTANODON (MARSH) 109 
clavicle the other elements have been retained in their mutual relations and estab- 
lishes for all time the relative position of the scapulee and coracoids of this genus. 
The position of the clavicles and interclavicle can be determined with a fair degree 
of accuracy. An examination of the roughened surfaces (a and x), for ligamentous 
attachment on the anterior borders of the scapulee shown best in Pl. XIL., figs. 1 
and 2, No. 919 evidently indicates the place of attachment for the clavicles. The 
firmly united clavicles evidently curved up along the anterior borders of the scapulze 
and coracoids, being attached to the former by ligaments at 7 and «, to the latter 
by the interclavicle, which fits into a groove on the posterior median side of the 
Fic. 21. Ventral view of the pectoral girdle, as found in the matrix. Baptanodon discus (No. 878). One fifth 
natural size. cl, clavicle ; co, coracoid ; 4, humerus ; 7.c/, interclavicle, sc, scapula. 
clavicles and extends back until its upper excavated surface laps under the anterior 
median union of the coracoids, the position in extant Lizards, thus forming a brace 
between the two parts of the girdle. In both specimens the girdle is formed essen- 
tially in the same manner as in Ichthyosawrus. 
Dr. Knight’s observation that: “There was no evidence of an interclavicle, and 
the peculiar union of the coracoids precludes an interclavicle of the regular Ich- 
thyosaurian type. In consequence the interclavicle in Baptanodon must be consid- 
