. Transactions of the American Philosophical Society. Fig. 3.—Mosasaurus sp., suspensorium of os quadratum of right side, one-tliird nat. size ; from Greensand ofNew Jersey. A, from front; B, from behind ; C, fractured end of proximal half seen at fracture, Or-b ; Exo, exoccipi-tal ; Pe, petrosal; Pao, paroccipital; Sts, suture for supratemporal; QA, articular surface for quadrate ; FO, fenestraovale ; VIII, foramen for eighth nerve ; a b, line of fracture. supratemporal foramen, and the bar the supratemporal ba)\ In Sphenodon the par-occipital and supratemporal are fused together. The
. Transactions of the American Philosophical Society. Fig. 3.—Mosasaurus sp., suspensorium of os quadratum of right side, one-tliird nat. size ; from Greensand ofNew Jersey. A, from front; B, from behind ; C, fractured end of proximal half seen at fracture, Or-b ; Exo, exoccipi-tal ; Pe, petrosal; Pao, paroccipital; Sts, suture for supratemporal; QA, articular surface for quadrate ; FO, fenestraovale ; VIII, foramen for eighth nerve ; a b, line of fracture. supratemporal foramen, and the bar the supratemporal ba)\ In Sphenodon the par-occipital and supratemporal are fused together. The supramastoid is fused eitherwith the supratemporal or the parietal (Fig. 9, PI. II, and Fig. 3, PI. lY). In the Ptthonomorpha and Lacertilia the zygomatic arch of the Rhyncho-cephalia has disappeared, leaving the superior or supratemporal arch only. That thisis truly the supratemporal arch and not the supramastoid is shown by the fact thatits anterior connection is with the postorbital as in Sphenodon, and not with the post- 20 POSTERIOR CRAXIAL
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