EXPLANATION OF PLATE X. 



Cranial bones oi rroioslcga gtgas, Cope, one-half natural size. 



Fig. 1. Maxillary boue : a, from without; b, from within. 



2. Deutary bone : a, from witliout ; b, from within ; c, anterior view. 



H. Posterior portion of inanililiular rau)n.s from within : a, ileutary ; 6, articular; c, angular bones. 



4. Posterior portiou of mandibular ramus from the outside ; letters the same. 



0. Quadrate and pterygoid bones of the riglit side from within. 



6. Quadrate boue of the same side from without. 



