. Bulletin - United States National Museum. Science. OSTEOLOGY OF CARNIVOROUS DINOSAURS. 23 part of the quadratojugal is 143 mm. the greatest diameter dorso-ventrally is 135 mm. Quadrate (q.).—The quadrate from the right side of skull No. 4734, , is perfectly preserved and since it was found detached from the posterior part of the skull I am able to describe this element in detail. This bone is relatively short having a greatest length dorso-vcntrally of 192 mm., with an irregularly rounded articular proximal end for articulation with the squamosal. The distal end is widely expanded tr
. Bulletin - United States National Museum. Science. OSTEOLOGY OF CARNIVOROUS DINOSAURS. 23 part of the quadratojugal is 143 mm. the greatest diameter dorso-ventrally is 135 mm. Quadrate (q.).—The quadrate from the right side of skull No. 4734, , is perfectly preserved and since it was found detached from the posterior part of the skull I am able to describe this element in detail. This bone is relatively short having a greatest length dorso-vcntrally of 192 mm., with an irregularly rounded articular proximal end for articulation with the squamosal. The distal end is widely expanded transversely with a smooth articulating surface that is bisected diagonally by a broad concave depression that divides this end into two elongate, obtusely rounded articular surfaces that fit closely into the cotyloid depressions of the lower mandible. The articulating surfaces of this end of the quadrate extend well up on the anterior and posterior aspects, bemg separated from the nonarticular part of these surfaces by a low but well defined undulating ridge. • Externally the quadrate is suturally united with the quadratojugal. The suture between the two bones beginning 31 mm. below the upper extremity is visible from a lateral aspect but just above the quadrate foramen it passes to the posterior view. As in Ceratosaurus and Tyran- nomurus the external boimdary of the quadrate foramen is formed by the inner surface of the quadratojugal. The pos- terior view presents a deep de- pression that slopes forward in all directions toward the cjuad- rate foramen. A widely rounded groove runs diagonall^^ fig. i.!.—right jugal, qu.*.dratojugal, and quadrate, of antkodemus downwartl from the inner sur- valens leidy. xo. 4734, } nat. size, viewed fkom the m- face of the cpuidrate to tlie quadrate foramen. Imme- diately above this groove on the median posterior side a pointed spurlike projection extends posteriorly. On the anterior inner side the quadrate sends anteriorly a thi
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