QAAAA. Scapular arch external to ribs; two longitudinal post-orbital bars (paroccipital arch distinct) (Archosauria). a. A supramastoid bone.
Ribs two-headed ; a clavicle and interclavicle ; acetabulum closed; no obturator foramen; ambulatory; vertebrae amphicoelous. Order 7, PELYCOSAURIA.
aa. No supramastoid.
1 Proc. Amer. Assoc. for the Advancement of Science, loth meeting (Cambridge, 1871, 8vo), pp. 230 sq.; Amer. Naturalist (1889), vol. xxiii. p. 863.
2 Syllabus of Lectures on the Vertebrata (Philadelphia, 1898, 8vo), P. 54.141
Ribs two-headed; interclavicle not distinct; external digits greatly elongated to support a patagium for flight. Order 8, ORNITHOSAURIA.
Ribs two-headed; no interclavicle; acetabulum open; ambulatory. Order 9, DINOSAURIA.
Ribs two-headed; an interclavicle; acetabulum closed; ambulatory. Order 1o, LORICATA.
Ribs one-headed; an interclavicle; acetabulum closed, a large obturator foramen; ambulatory. Order
1I,
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