PHYLOGENY OF THE PALZOGNATH.E AND NEOGNATHZ, 217 
Fig. 4. 
A.—Ventral aspect of the sternum of Vromeus nove-hollandic, to show the form and position of the coraciod 
grooves and anterior lateral processes. 
B.—Ventral aspect of the sternum of Dromeus ater. Note the degenerate condition of the coracoid grooves 
and the well-marked protuberantia sterni. 
C.—Ventral aspect of the sternum of Lthea macrorhyncha for comparison with that of Dromeus. Note the 
difference in the position of the coracoid grooves, of the articulation for the sternal ribs, the large 
protuberantia sterni, and the thin places indicated by shading denoting the position of former 
fenestre or fissures. 
D,—Ventral aspect of the sternum of an embryo Apteryw after Parker, to show the possible vestigial keel. 
a.s. = articulation for sternal rib. 
¢.g. = coracoid groove. 
a.l.p. = anterior external process. 
ps. = protuberantia-sterni. 
p-l.p. = posterior lateral process. 
k, = keel. 
v.¢.g. = ventral lip of coracoid groove. 
