Vol. 5] Miller.— Wading Birds of Bancho La Brea. 443 



seen in section from this position. In C. alba and C. maltha 

 these ridges project almost straight backward. In Euxenura 

 they appear thrust over toward the inner side, and the outer 

 ridge instead of the inner is the more prominent. The whole 

 effect is to make the tarsal head in Euxenura seem distorted by 

 a rotation upon the shaft from within outward. 



Tibia. — No. 12527. No complete tibia is at hand, but frag- 

 ments of proximal and distal ends represent this bone. Both 

 specimens of the distal end are of the left limb. They agree most 

 perfectly in both size and characters. 



No. 12527 is appreciably smaller than Euxenura and is dis- 

 tinctly more like C. alba. Euxenura appears almost gruine in a 

 superficial way. 



Viewed from in front the distal opening of the tendinal 

 tunnel is nearly a perfect circle and the tubercle above it lies 

 just against its outer border. In C. alba the tunnel mouth is 

 slightly flattened and in Euxenura almost lip-like, while in 

 both the tubercle is removed slightly toward the outer side of 

 the bone. In C. maltha a more distinct ridge runs up the shaft 

 from the outer border of the tunnel intake. 



C. maltha and C. alba are distinguishable from Euxenura by 

 the more nearly circular depression into which the intercotylar 

 tuberosity of the tarsus fits. 



In the latter, this depression is made gruine in its aspect by 

 being expanded transversely and thus encroaching upon the 

 inner condyle. Seen from the side, the chord of the curved distal 

 profile is more nearly at right angles with the shaft so that the 

 fragment will stand unsupported on its end. In Euxenura, a 

 similar fragment falls toward the rear. C. alba agrees more 

 nearly with Euxenura in this point. 



Seen from the rear, the articular surface is not set off from 

 flic shaft by a transverse limiting ridge as in Euxenura and 

 Ciconia alba. Seen from the inner side this latter feature is 

 evidenced by a less abrupt concavity of the posterior profile. The 

 tubercle seen on this side in Euxenura and C. alba is much less 

 prominent in C. maltha, in fact, the region of ligament attach- 

 ment is so diffuse, as to be scarcely recognizable as a tubercle. 



The proximal fragment of the tibia, no. 12529, presents the 



