5 
(PL I, Fig. 1), where the neural arches become much shorter, there seems to 
he no basal expansion, so that the successive segments of the series are 
separated by conspicuous gaps. The haemal arches in the abdominal region 
are imperfectly shown in the type specimen, but better in the fragment No./ 
(PI. I, Fig. G, ha.) Each arch consists of a pair of expanded pieces of 
calcified cartilage, which appear to he nearly square and slightly saddle- 
shaped when viewed from the attached face, but triangular when seen from 
the side. To the apex of each cartilage is fixed a short slender rib (r). The 
•continuation of the haemal series in the caudal region is well shown in the 
type specimen, the arches being crushed and displayed in various aspects. 
At first they are much smaller than the opposed neurals, hut soon they 
become symmetrical with the latter. All the anterior caudal haemal arches 
have an expanded triangular base, which rapidly tapers into the slender 
haemal spine, and there is no separation into distinct elements. The posterior 
arches may have been as little expanded at the base as the opposed neurals* 
There are no clear indications of intercalary cartilages either dorsally or 
ventrally. 
Appendicular Skeleton . — The pectoral girdle is shaped as usual in 
Fleur acanthus, and above the remains of the scapula in the type specimen 
(PI. I, Fig. 1, sc.) the small elongate-triangular suprascapula ( ssc .) is 
distinct. The pectoral fin ( pet .) in the same specimen is imperfect and 
obscured by pyritised remains of the fish ; hut parts of it are shown more 
clearly in two other fossils (PI. I, Figs. 7, 8). At least the three large 
proximal segments of the axis of this fin are longer than broad. The basal 
segment itself is only imperfectly seen in the type, hut four or five preaxial 
rays, which must have been supported by it, are shown in Fig. 8 ( pr .). From 
the distal end of what appears to be the third segment onwards the preaxial 
rays are best seen in Fig. 7. Twelve of these are indicated, all with the 
proximal segment of the same length, namely, between four and five times 
as long as broad ; and the upper four exhibit the second segment nearly twice 
as long as this. There is then a third segment, which is partly broken away 
in the fossil. The preaxial border of the fin is strengthened by delicate 
dermal filaments (actinotrichia), which are conspicuous upon and between 
the distal ends of the cartilaginous ravs in Fi" 7. The fossils are not 
sufficiently well preserved to exhibit any of the postaxial rays. Remains of 
both pelvic fins are shown in the type specimen (PI. I, Fig. 1, plv ), which is 
a male; and the fin of the left side is moderately well displayed. The 
