. The Ceratopsia. Ceratopsia. Fig. 24.—Portion of central region of skull of Triceratops horridus (type), No. 1820, Yale Museum, as seen from right side with external wall removed, showing relations of the various internal bones of the cranial region to one another, h, Supraorbital horn core; pf, postfrontal; x, cavities in postfrontal; of, olfactory foramen; al, alisphenoid; o, optic foramen; fo, foramen ovale; earn, external auditory meatus; flp, foramen lacerum posterius; 6s, basisphenoid; pt, pterygoid; pi, palatine; tr, transverse; q, quadrate; qj, quadratojugal surface; as, articular sur
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. The Ceratopsia. Ceratopsia. Fig. 24.—Portion of central region of skull of Triceratops horridus (type), No. 1820, Yale Museum, as seen from right side with external wall removed, showing relations of the various internal bones of the cranial region to one another, h, Supraorbital horn core; pf, postfrontal; x, cavities in postfrontal; of, olfactory foramen; al, alisphenoid; o, optic foramen; fo, foramen ovale; earn, external auditory meatus; flp, foramen lacerum posterius; 6s, basisphenoid; pt, pterygoid; pi, palatine; tr, transverse; q, quadrate; qj, quadratojugal surface; as, articular surface for lower jaw; rax, m, maxillary; v, vomer; n, nasal; no, nasal opening; nh, nasal horn; pmx, premaxillary; r, rostral. One-twelfth natural size. Just above this process the anterior border of the palatine incloses posteriorly an elongated oval foramen, which is bounded anteriorly by the ascending branch of the maxillary. This foramen passes from the cavity of the mouth to the infratemporal cavity and may be called the maxillopalatine foramen. It is situated, as shown at v, fig. 20, just below the much smaller infraorbital foramen, from which it is separated by a slender process of the maxillary. Above, the palatines approach each other and embrace between them the vomers, the superior extremity of the pterygoids, and the median blade of the alisphenoids. The articulation of these various elements with one another is well shown in the accompanying figures. THE VOMER. Only the posterior portion of the vomer is shown in any of the skulls at my disposal, though it is possible that it may be complete in some of the skulls not yet fully prepared. The vomer is present in a skull, No. 970, of the collections of the American Museum of Natural History, and has been described as follows by Dr. R. S. Lull:a. The vomer or " prevomer" as determined by Broom is a slender, rod-like bone bridging fore and aft the space of the narial fenestra. Anteriorly it is dilated into a fl