. On the anatomy of vertebrates [electronic resource] . paroccipitals. The parie-tals form one bone, perforated by a small ( foramen parietale closeto the coronal suture. The frontals, n, contribute a share to thesuperorbital border; their median suture is distinct, as is that 1 CXLVII. p. 388. 160 ANATOMY OF VERTEBRATES. between the nasals, 15. The prefrontal, u, extends to the nostril, lacrymal, 13, forms the rest of the fore part of the orbit, ex-tending forward upon the face. The sides of the premaxillary, 22,bend abruptly down in front of the nostrils, to join the maxillary,20, 21 ;
. On the anatomy of vertebrates [electronic resource] . paroccipitals. The parie-tals form one bone, perforated by a small ( foramen parietale closeto the coronal suture. The frontals, n, contribute a share to thesuperorbital border; their median suture is distinct, as is that 1 CXLVII. p. 388. 160 ANATOMY OF VERTEBRATES. between the nasals, 15. The prefrontal, u, extends to the nostril, lacrymal, 13, forms the rest of the fore part of the orbit, ex-tending forward upon the face. The sides of the premaxillary, 22,bend abruptly down in front of the nostrils, to join the maxillary,20, 21 ; this forms the lower boundary of the nostril, n, and joinsabove and behind with the prefrontal, lacrymal, and nasal bones :the maxillary projects below the orbit, like a forward continuationof the zygoma, becomes more prominent as it advances, and soonforms the outer angle of the three-sided socket of the canine tusk, is a single but strong zygomatic arch formed by the malar,26, and squamosal, 27, abutting against the upper end of the tym- 99. Skull of Dicynodon panic pedicle, 28. The rami of the lower jaw augment in depthfrom the angle to the symphysis, where they are confluent. Theangle projects a very little way beyond the articulation. Thearticular surface is moderately concave, and looks obliquely up-ward and backward. The elements of the posterior half of theramus answer to the articular, angular, 26, and surangular, 25. Athin vertical splenial plate, on the inner side of the ramus, beginsabout an inch in advance of the angle, and extends forward to thesymphysis, at the back part of which it appears to become con-fluent with its fellow. The part answering to the angular divergesfrom the surangular, and forms the hind boundary of an oblongvacuity at the middle of the side of the ramus, the fore part ofwhich vacuity is formed by a bifurcation of the dentary element,23. This is thickened and strengthened by a ridge, subsiding atthe vertical channel upon the side of
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