ral margin of intertemporals; circumorbital plates
lightly ossified. Palatoquadrate complex consisting of endopterygoid and
ectopterygoid (both toothed on medial surface), quadrate, and
metapterygoid, the latter smooth and having widened border for
articulation on anterodorsal margin. Pectoral girdle consisting of
cleithrum and clavicle (supracleithrum not seen); small projection on
medial surface of posterior portion of cleithrum; horizontal medial
process on clavicle. Pelvic plate bearing three anteriorly diverging
apophyses, and one denticulate ventromedian process for articulation to
opposite plate. Lepidotrichia jointed distally, but not tuberculated.
Scales oval, having posteriorly converging ridges on posterior exposed
parts.

The name refers to the most distinctive character of the genus, the
connected antotic and basipterygoid processes on the basisphenoid, and
is derived from Greek, _synaptos_--joined, _tylos_ (masc.)--knob,
projection.

_Synaptotylus_ is excluded from the advanced suborder Coelacanthoidei by
the retention of basipterygoid processes on the basisphenoid.
_Synaptotylus_ differs from _Rhabdoderma_ in several characters of the
basisphenoid, the most important being: knoblike antotic processes
(those of _Rhabdoderma_ are wider, more flattened and more dorsal in
position); small, lateral basipterygoid processes (in _Rhabdoderma_
these are larger and farther ventral in position).

~Synaptotylus newelli~ (Hibbard)

_Coelacanthus newelli_ Hibbard, 1933, Univ. Kansas Sci.
Bull., 21:280, pl. 27, figs. 2, 3.

_Coelacanthus arcuatus_ Hibbard, 1933, Univ. Kansas Sci.
Bull., 21:282, pl. 26, fig. 8; pl. 27, fig. 1.

_Rhabdoderma elegans_ Moy-Thomas, 1937 (in part), Proc.
Zool. Soc. London, 107(ser. B, pt. 3):399.

_Type._--K. U. no. 786F.

_Diagnosis._--Same as for the genus.

_Horizon._--Rock Lake shale member, Stanton formation,
Lansing group, Missouri series, Upper Pennsylvanian.

_Localities._--The specimens studied by Hibbard (K. U. nos.
786F, 787F, 788) and no. 11457 were taken from the Bradford
Chandler farm, from the original quarry in SW-1/4, SE-1/4,
sec. 32, T.19S, R.19E. The remainder were collected from
University of Kansas Museum of Natural History locality
KAn-1/D, a quarry in sec. 5, T.19S, R.19E. Both of these are
approximately six miles northwest of Garnett, Anderson
County, Kansas.