AND AVES OF NORTH AMERICA. 37 



on the hinder aspect of a dorsal has a disciform articular surface directed outwards and downwards : the prominence 

 of its upper face is continuous with the lateral ridge of the neural spine. The anterior uplooking surface is equally 

 small and little divergent. 



Inches. 



Vertical diameter centrum dorsal, 3.42 



Transverse " " " 2.7 



Antero-posterior diameter centrum dorsal, (helow,) 1.85 



Vertical diameter centrum dorsal, (poster,) 2.98 



Transverse " " " 2.9 



" " neural canal, .80 



Longitudinal diameter base neural spine, 1.22 



" " " diapophysis 1.2 



Length between extremities zygapophyses, (dorsal,) 2.26 



Depth of cup of vertebra?, .63 



Length centrum anterior caudal, 1 .73 



Distance between bases chevron bone, (caudal,) 2.58 



Length two coossified caudals, 2.3 



Width anterior in front, 1.7 



Depth " " .9 



It may be observed the anterior caudals have a nearly round articular extremity ; one of them is a little wider 

 than high, but they are too much distorted to furnish reliable measurements. 



The portion of ilium preserved is an extremity. It is flat on one side and convex on the other. The shaft is 

 solid. The articular extremity is oblique, and presents a truncate extremity, which is at right angles to a short 

 recurved margin, which has been an insertion or articulation ; the flat surface is rugose distally. Long diameter of 

 extremity, 2 in. .75 ; of shaft, 1.9 in. The articular faces of the extremity of the femur are at an open angle with 

 each other, and are strongly concave in transverse section. The femur is here very flat, with narrow margins: it 

 becomes stouter with diminishing width. Distally the surface is marked by grooves and small foramina. What may 

 be tibia is the basal frustrum of a wedge ; the articular faces broad, the outer margin narrowed ; the faces slightly 

 concave. The inner margin is shorter than the outer, and the distal part of it presents a broad articular face. Some 

 of the tarsal bones have been already described. There are thirteen metatarsals and phalanges. They are of stout 

 proportions and are considerably constricted medially. Those of one series are square in section ; those of another, 

 transverse; those of the third transverse with one edge thinned or acuminate in section. Some of each form are 

 more elongate than others. 



Inches. 



Width femur at extremity, (restored, ) 8. 



Depth " " (median,) 1.3 



Width " four inches from extremity, 6. 



Thickness femur " " " 1.95 



Width tibia, 3.88 



Length externally, 2.6 



Width tarsi tibiale, 2.48 



Thickness " " 1.52 



Length parallelopiped phalange, 1.56 



Width " " 1.2 



Thickness " " 1.2 



" depressed " 1. 



Width " " 1.4 



Length " " 1.9 



AMEEL PHT.LOSO. SOC. VOL. XIV. 10 



