. Bulletin - United States National Museum. Science. OSTEOLOGY OF THE ABMOKED DINOSAUKIA. 27 Known elements of the Stegosaurian skull.— Alisphenoid al. sp Angular an Articulai- ar Basispheiioid Js Basioccipital 60 Deutary ^ Exoccipital Frontal y Jugal j Lachrymal i Maxillary m Na-sal jj Orbitosphenoid Palatine pi Prespheiioid p,sp Paraoccipital (opisthotic) Parietal n Postorbital pg Postfroiital pQ J- Posts Lipraorbital. no. so Pi'efrontal pf Preiaaxillary p^ Prearticular „ ^^ Predeiitary pj Presupraorbital p sq Prootic Pterygoid - pi Quadrate « Quadratojugal qj Splenial g
. Bulletin - United States National Museum. Science. OSTEOLOGY OF THE ABMOKED DINOSAUKIA. 27 Known elements of the Stegosaurian skull.— Alisphenoid al. sp Angular an Articulai- ar Basispheiioid Js Basioccipital 60 Deutary ^ Exoccipital Frontal y Jugal j Lachrymal i Maxillary m Na-sal jj Orbitosphenoid Palatine pi Prespheiioid p,sp Paraoccipital (opisthotic) Parietal n Postorbital pg Postfroiital pQ J- Posts Lipraorbital. no. so Pi'efrontal pf Preiaaxillary p^ Prearticular „ ^^ Predeiitary pj Presupraorbital p sq Prootic Pterygoid - pi Quadrate « Quadratojugal qj Splenial g Squamosal g„ Surangular jq Supraoccipital gg Vomer .. „. <^—i:^ FiQ. 3.—Skull OF Stegosaurusstenops Marsh. Lateral view. Type. Cat. no. , U S N M THAN 1 NAT. SI2K. a. ANTERIOR NARES; an, ANGULAR; ar, ARTICULAR; b, ORBIT; C, tNTBA TEMPORAL ;!A; d. ; j, JUGAI,; l, LACHRYMAL; m, ; ; OC, OCCTPrTAl condyle; , prearticular; pri, predentary; pf, prefrontal; pm, premaxillaey- pn POSTORBITAL; p. OC, PARAOCCIPITAL; , POSTSUPRAORBITAL; , PRESUPRAORBITAL; 7, QUAD- RATE; qj, quadratojugal; s, splenial; sti, surangular; ,??, squamosal. Description.—A study of this material shows that Marsh's figures of the skuU of Stegosaurus stenops, which have appeared in numerous Americian and European pubhcations, are incorrect in many of their details. The inaccuracies are in great part due either to the complete coalescence or to the obscure condition of many of the sutures, and also in some instances to a wrong interpretation of cracks in the skull (No. 4934) as representing sutural articulations. These errors have been cor- rected in the drawings, and a more detailed mention of them will follow in the discussion of the separate skull elements. Viewed from the side (pi. 5 and fig. 3) the skuU of Stegosaurus is long and slender, the facial portion being especiaUy produced. With the jaw in position the outline of the skuU IS wedge
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