Vol. 5] Miller .—Wading Birds of Bancho La Brea. 445 



Pectoral Arch. — This portion of the skeleton is represented 

 by three coracoids and a fragmentary furcula which includes the 

 symphysis and most of the right clavicle. 



Furcula no. 12526 is of the same size as in Euxenura, but 

 slightly more slender. The symphyseal region is longer in the 

 sagittal plane, the area of sternal attachment is larger and more 

 oblique with the shafts of the clavicles. The angle included 

 between the clavicles is greater and more distinctly "U" shaped. 



The coracoid, no. 12425, is almost identical with that of 

 Euxenura; the length is slightly in excess. The shaft is slightly 

 less flattened, and narrows much less abruptly from its extended 

 base toward the head. The facet of the sternal articulation is 

 much more expanded transversely. The head region differs in 

 being longer as measured from the scapular fossa. The dorsal 

 and ventral edges of the head are sharper and more definitely 

 ridged. The concave surface of the head is less richly provided 

 with foramina, and the foramina are smaller, thus suggesting 

 less pneumaticity. The clavicular facet is about equally pro- 

 nounced. A series of four coracoids from the asphalt beds show 

 these characters to be very constant in the new form. 



Table op Measurements. 



Tibia, distal end, no. 12527. 



Greatest transverse diameter 



Greatest sagittal diameter of entocondyle 

 Greatest sagittal diameter of ectocondyle 



18.6 mm. 



23.3 

 22.6 



Coracoid, no. 12425. 



Length to inner edge of sternal facet 



Transverse diameter below scapular facet 



Dorsiventral diameter of head 



Least diameter of scapular facet 



89.8 

 11.2 

 24.1 

 8.7 



Tarso-metatarsus, no. 11202. 



Approximate length along axis 



Least transverse diameter 



Least anteroposterior diameter 



Transverse diameter of proximal end . 

 Transverse diameter through trochleae 



256.0 

 9.0 

 5.8 

 20.7 

 22.9 



Beak, no. 12532. 



Depth at anterior end of nostril 

 Width at anterior end of nostril 



Length of nostril 



Depth of nostril 



23.8 

 26.5 

 23.5 

 3.3 



