169 
THE ANATOMY OF BIRDS. — OSTEOLOGY. 
Fia. 75. — Dromeognathous skull of ostrich, 7-8 nat. size, from specimen No. 16,629, U. S. Nat. Museum, by Dr. R. W. Shufelit, U.S. A. £J?, rostrum, beyond 
which the ossified nasal septum continues in the axis of the skull to the letters ““ Pmx.” V, the short vomer, borne upon R, uniting laterally with Mxp, the broad 
maxillo-palatines; Pl, palatines, remote from rostrum, underrunning beyond Mzxp, but not to Pmx. Pt, expanded scroll-like pterygoids, articulating behind with 
Btp, the strong basipterygoid processes on the body (not rostrum) of the sphenoid; they underlap FR, but do not articulate there. Pm, premaxillaries; Mz, maxil- 
laries, whose ends run forward to opposite the letters “ Pmx”’; j, jugal; gj, quadrato-jugal; Qu, quadrate. (N. B. This is the most exceptional case of dromogna- 
thism. Each one of the Ratite families, — Struthionide, Rheide, Casuariide, Dinornithide, and Apterygide ,—as well as the Carinate family Tinamide, offers 
a special case of such formation, as explained in the text.) 
articulate with facets which are situated 
body of the basisphenoid and not from the rostrum, 
This is 
nearer the posterior than the anterior ends of the inner edges of the pterygoid bones.” 
