Page:The Osteology of the Reptiles.pdf/51

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. 20. Seymouria haylorensis. Skull and pectoral girdle: from the side. One half natural size, pm, premaxilla; m, maxilla; l, lacrimal; n, nasal; pf, prefrontal; j, jugal; po, postorbital; sq, squamosal; qj, quadratojugal; cl, clavicle; ic, interclavicle; sc, scapula; c, coracoid.

But few modifications of the primitive characters of the skull are known in this order. The parietal foramen is absent in one or two