146 Prof. EL G. Seeley. The Shoulder Girdle 



concave. The cervical and caudal ribs and neural arch are anchylosed 

 to the centrum. The cervical neural spine is short. The zygapo- 

 physes are rather less cylindroid. The scapulae are unfortunately im- 

 perfect ; enough is preserved to show that they were wide anterior to 

 the scapulo-coracoid foramina, but not enough to show how they 

 terminated in front. The coracoids are large, and have the postero- 

 lateral prolongation of the bone well developed, as in Colymbosaurus. 



There are two bones found with this specimen which I regard as 

 clavicles. Unlike other specimens,* they unite with each other by 

 an ovate suture, which is from half to three-quarters of an inch long, 

 and they are inclined to meet each other anteriorly at an angle of 

 45°, which is about the same as the angle of inclination of the 

 scapulae. The left clavicle is an oblong plate 4J inches long as 

 preserved, but imperfect on both the posterior and internal margins. 

 The right fragment is Sj inches long. The anterior end is 

 truncated, and hardly extends beyond the articulation, where the 

 transverse measurement of the bone is 1^ inch. Just behind the 

 articulation, the inner border has a concavity more than half an 

 inch long, notching out the border in both specimens ; but behind 

 the notch the bone is broken away. ■ Its smooth external border is 

 slightly concave in length, and is prolonged diagonally outward and 

 backward. The width of the left plate at the posterior fracture is 

 about 2 inches. 



* Mr. Leeds info 'ms me that he has since obtained another type in which the 

 two triangular clavicles meet in the median line, without trace of an interclavicle. 



