no. 11426) shows a small, caudally directed projection
of bone, evidently for articulation of the fin-skeleton, at the widest
portion of the cleithrum. Sutures on several specimens were indistinct.
Broken specimens show sutural faces, but many nearly complete specimens
show little or no indication of sutures, without regard to size of the
girdles. The internal structure of the fin was not observed.

Numerous isolated basal plates of the pelvic girdle have revealed
details of structure but no information on the orientation. Presumably
the basal plates of _Synaptotylus_ had essentially the same orientation
as those of other coelacanths (Moy-Thomas, 1937:395). The most complete
basal plate is K. U. no. 788 (see fig. 6B). The three apophyses diverge
anteriorly; the horizontal one is best developed and the dorsal one is
least well developed. A median process (Schaeffer, 1952:49), denticulate
on several specimens, articulates with the corresponding process of the
opposite plate. The expanded part that articulates with the skeleton of
the fin extends caudally. The posterior expanded part is nearly square
in outline, resembling the dorsal, rectangular projection. One side
bears ridges leading to the extremities of the apophyses, and faint
crenulations on the median process. This may be the medial view. The
other view displays a smooth surface, usually without indication of the
ridges seen in the reverse view. These specimens differ somewhat from
the basal plates of _Rhabdoderma_ and appear to be intermediate between
_Rhabdoderma_ and _Coelacanthus_ (Moy-Thomas, 1937:fig. 10A, B). The
apophyses are not free as in _Rhabdoderma_ but webbed with bone almost
to their extremities, as in _Coelacanthus_.

The pelvic fin is seen in only two specimens (K. U. nos. 786F, 788).
That on no. 788 is lobate and has 25 lepidotrichia, jointed for
approximately the distal half, and 2.5 to 13.0 mm. in length. Total
length of the fin is 25.0 mm. There is no trace of the internal skeletal
structure or of the articulation to the basal plate in either specimen.
For a description of the fin on no. 786F, see Hibbard (1933:281).

_Unpaired fins_

A few isolated bones on K. U. no. 788 (fig. 7) are interpreted as basal
plates of the unpaired fins. For additional description of the unpaired
fins on the type, K. U. no. 786F, see Hibbard (1933).

Two of these bones are flat, smooth and oblong, bearing a diagonal ridge
that extends in the form of a proje