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