MACROPOMA. ag 
specimens, there is apparently an ossified cartilage-bone of the scapular arch. 
This is somewhat crushed in the original of Pl. XX XVIII, fig. 1 (sc.), but it is 
seen to be hour-glass-shaped and shghtly twisted on its longer axis. Part of its 
distal end is thicker in the original of Pl. XXXVI, fig. 9 (sc.), and in another 
fossil in the British Museum (no. P. 2051), where its widely-expanded proximal 
end is shown in contact with the concave face of the clavicle. The short rounded 
lobe of the pectoral fin does not exhibit any traces of the internal skeleton, but it 
is covered with small ornamented scales (e.g.imn B. M. no. 4252). The pectoral 
lobe is frmged by about twenty fin-rays, in which the unjointed base is relatively 
long. The pelvic fin-supports (Pl. XXXVI, fig. 4) are a pair of triradiate bars, 
of which the longest arm is directed forwards and becomes slightly expanded 
distally. A gently curved narrow arm bends inwards to a somewhat crimped 
symphysis; while the outer arm forms a triangular expansion at the base of the 
lobate fin. Here again the endoskeletal elements which directly support the 
fringe of fin-rays are never preserved. As a whole the pelvic fin is somewhat 
smaller than the pectoral and comprises fewer rays. None of the rays in either 
of these fins are spinose or tuberculated. 
Of the median fins the anterior dorsal, as usual in Coelacanths, comprises the 
stoutest rays, which do not surround a lobe but are directly supported by the 
straight edge of a plate of bone (Pl. XXXVI, figs. 1, 2, do.'). The shape of this 
supporting plate is shown in the restoration, Text-fig. 49, p. 173, where its 
radiating strengthening ridges are also indicated. Of the eight fin-rays the first 
four are nearly equal in length, while the last four rapidly shorten backwards: in 
each ray the right and left halves are firmly fixed together, and a comparatively 
short distal portion is subdivided by distinct transverse joints. The front margin 
of each ray is provided with a double series of upwardly-pointing denticles which 
are loosely inserted in shallow pits: on the foremost ray there are also a few 
supplementary denticles. The posterior dorsal fin is lobate and comprises from 
fifteen to twenty slender rays, which have a relatively long unjointed base and 
are destitute of denticles (Pl. XXXVI, fig. 5). Its lobe is covered with thin, 
tuberculated scales, and does not exhibit any traces of its endoskeleton ; but at its 
base there is always a well-ossified, forked support (Pl. XXXVI, figs. 1, 2, do.’). 
The anal fin, of which a fragment is preserved in the type specimen (a.), resembles 
the posterior dorsal and has a similarly-forked support, but it is shghtly smaller 
and situated a little further back than the last-named fin. The caudal fin 
(Pl. XXXVI, figs. 1, 3, c.) comprises about twenty stout rays above and below 
the vertebral axis and forms a symmetrical termination of the fish. The actual 
end of the body is a slender, scaly lobe, which hes between the upper and lower 
halves of this fin, and tapers to a poimt without any fringing rays (Pl. XXXVI, 
fig. 3, t.). The caudal fin-rays scarcely diminish in length as they are traced 
backwards, and they are not expanded in their distal half where they are crossed 
