The Philippine journal of science. [Vol. 67, no. 1]

67, 4

Rabor: Anatomy of Bangos

367

GIRDLES AND FINS
Shoulder girate and fins (Plate 3; Plate 4, figs. B and D).The uppermost bone of the shoulder girdle is the supratemporal
(Plates 3 and 4; text fig. 1, 52) which is followed ventrally by
the posttemporal (Plate 4, 54). These two bones of the temporal series have already been dealt with'. Both serve to connect the remaining ventral elements of the shoulder girdle to
the skull, although the latter, through its dorsal epiotic limb
and ventral opisthotic limb, performs the greater part of the
work.
Below the posttemporal, extending downward and backward,
is the slightly curved flattish supraclavicle (Plates 3 and 4, 55),
shaped like the blade of a knife. Its entire posterior border is
thin and sharp. Its posterior third is closely but not immovably
applied to the outer anterior border of the ascending dorsal limb
of the clavicle.
The clavicle (Plates 3 and 4, 56) is long and runs forward and
downward. Its curving ventral portion is expanded mesially,
the thin expanded portions of both clavicles closely meeting but
not totally fusing in the median line, producing a prominent
ridge.
Behind the base of the clavicles at the curve, the small, thin,
and slender scalelike postclavicle (Plates 3 and 4, 57) is slightly
attached. Its posterior end is also applied closely along the
whole length of the short posterior dorsal spine of the hypercoracoid (58), somewhat strengthening its slight attachment.
It extends backward and downward through the muscles of the
base of the pectoral fin. Unless great care is taken in the dissection of these parts, the postclavicle is easily lost.
Two irregularly flat bones, the hypercoracoid (Plates 3 and 4,
58) and the hypocoracoid (Plates 3 and 4, 59) the former slightly
smaller and placed posterodorsad of the latter, are immovably
articulated with the clavicle. The former articulates with the
clavicle by means of a broad anterodorsally directed limb, and
with its mate, through its ventral region. It possesses a large
foramen on its anterior part. The hypocoracoid articulates with
the base of the clavicle in two places; posteriorly, by means of
a posterodorsal projection which meets a similar posteroventral
projection of the clavicular base, and anteriorly, through its
pointed anterior tip which meets an anteroventral projection of
the clavicle.
24117 —3