ction. Orientation is completely
unknown. These may be basal plates of the anterior dorsal fin. The fin
on no. 786F that Hibbard (1933:281) interpreted as the posterior dorsal
fin is now thought to be the anterior dorsal fin.

[Illustration: FIG. 7. _Synaptotylus newelli_ (Hibbard). Basal plates of
unpaired fins. A, anterior dorsal fin, based on K. U. no. 788, x 10. B,
posterior dorsal fin, based on K. U. no. 788, x 12. C, anal fin, based
on K. U. no. 11450, x 5. Anterior is toward the left.]

One distinctive bone may represent the basal plate of the posterior
dorsal fin. This incomplete specimen shows two projecting curved
processes, bearing low but distinct ridges, which diverge, probably
anteriorly. The central portion is narrow. The two ridges continue onto
the posterior portion. This has been broken off, but shows that the
ridges diverge again. The surface is smooth, except for the ridges. As
before, orientation is uncertain. On no. 786F this fin was interpreted
by Hibbard (1933:281) as the anal fin.

Only part of one basal plate of the anal fin was preserved on K. U. no.
11450. That plate is oblong and has an expanded anterior end. The
narrow, constricted part bears two oblique ridges and a few tubercles.
The posterior part has nearly straight margins (represented by
impressions) and the posterior margin is oblique, sloping
anteroventrally. The flared anterior part has a smooth surface. This
basal plate is more nearly like those of _Coelacanthus_, according to
the descriptions given by Moy-Thomas (1937:399). The basal plate is
associated with seven apparently unjointed, incomplete lepidotrichia.
The anal fin on no. 786F is interpreted as the anterior dorsal fin
(Hibbard, 1933:281).

The caudal fins are preserved on K. U. nos. 786F, 787F, and have a total
of 24 lepidotrichia, 12 above and 12 below. These are jointed for the
distal half or two-thirds, and are up to 16.0 mm. in length. In specimen
no. 787F the supplementary caudal fin has at least seven lepidotrichia,
the longest of which is 11.0 mm. but incomplete. Anterior lepidotrichia
appear unjointed but the posterior ones are jointed for the distal
two-thirds (?) (these are broken off). The supplementary caudal fin is
approximately 1.5 mm. long and 8.0 mm. or more wide. The supplementary
caudal fin on K. U. no. 786F described by Hibbard (1933:281) could not
be observed; this part of the caudal fin is missing.

_Squamation_

In the suite of specimens is