. Bulletin of the British Museum (Natural History), Geology. 284 REVISION OF ACTINOPTERYGIAN AND COELACANTH FISHES The premaxilla is a small bone bearing from eight to ten closely set teeth, of much the same appearance as those found on the maxilla. A fragment of bone appearing above the premaxilla is undoubtedly the remains of a rostral bone. The maxilla is a long slender bone, thickened anteriorly and deepened behind. The tooth arrange- ment on this bone is of interest since one of the generically distinguishing features between this species and Furo is the enlargement of the inner clustered
. Bulletin of the British Museum (Natural History), Geology. 284 REVISION OF ACTINOPTERYGIAN AND COELACANTH FISHES The premaxilla is a small bone bearing from eight to ten closely set teeth, of much the same appearance as those found on the maxilla. A fragment of bone appearing above the premaxilla is undoubtedly the remains of a rostral bone. The maxilla is a long slender bone, thickened anteriorly and deepened behind. The tooth arrange- ment on this bone is of interest since one of the generically distinguishing features between this species and Furo is the enlargement of the inner clustered teeth. In specimen Ox. M. J 3033 Woodward (1895a : 205) maintained that the maxilla and mandible bore only a single series of teeth, and that the cluster of teeth appearing below the maxilla pertained to the ectopterygoid, whilst those above the dentary to the splenial. By acid development I have been able to show that this is incorrect, as on both the upper and lower jaws there are often two to three rows of teeth. Ssc. ,°P Sop Pop Den Mx Smx 20mm Fig. 24. Osteorachis macrocephalus Egerton. Reconstruction of the dermal bones of the skull in lateral view. The outer teeth are long, slender, hollow and pointed, the inner ones being similar in shape, but smaller. These inner teeth are not very much different from those covering the ectopterygoid and splenial. The fact that most of the palatal bones are covered by teeth makes the total absence of teeth on the parasphenoid difficult to understand. Above the posterior margin of the maxilla a single supramaxilla occurs. This is a small bone, distinctly pointed at its anterior end. Immediately in front of the preopercular two fair sized bones can be seen, one above the other, with a smaller one separating them. These represent the suborbital series. They are very similar in proportion to those found in Caturus, the similarity in the respective cheek bones of these two genera being striking. The opercular itself is a large bone rounde
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