. Bulletin of the British Museum (Natural History), Geology. 246 REVISION OF ACTINOPTERYGIAN AND COELACANTH FISHES deeper than broad and larger than the opercular. There are fifteen branchiostegal rays on each side, broadened anteriorly and delicately ornamented with concentric striations. The gular plate is relatively small in this species and it is similarly ornamented to the branchiostegal rays. The lower jaws are stout and bear numerous teeth along their posterior margins. The dentition is similar to that of the maxilla with two series present. The teeth of the larger series are somewhat s
. Bulletin of the British Museum (Natural History), Geology. 246 REVISION OF ACTINOPTERYGIAN AND COELACANTH FISHES deeper than broad and larger than the opercular. There are fifteen branchiostegal rays on each side, broadened anteriorly and delicately ornamented with concentric striations. The gular plate is relatively small in this species and it is similarly ornamented to the branchiostegal rays. The lower jaws are stout and bear numerous teeth along their posterior margins. The dentition is similar to that of the maxilla with two series present. The teeth of the larger series are somewhat stouter than the corresponding ones found in the maxilla. Of the other skull bones little can be made out. Appendicular skeleton. The pectoral girdle is not complete in any of the specimens, but its general form can still be ascertained. The supracleithrum is a wide bone stretching from the expanded suprascapular to midway down the subopercular. Here it joins a somewhat reduced cleithrum. A small almost circular postcleithrum is also present. The fin itself is small with between eighteen and twenty lepidotrichia. The rays are distally dichotomized and distantly articulated. The fin has a narrow insertion and there are no fulcral scales present. Ra. Fig. 2. Coccolepis liassica Woodward. Girdle and supporting structures of the pelvic fin. From P 3697 and P 894. The structure of the pelvic fins and girdle can be seen on P 894 and its counterpart P 3697 (Text-fig. 2). Internally there is a paired skeletal structure of rather unusual form, consisting of an almost square plate with a projection from its antero-dorsal corner. This projection meets that of its opposite member to constitute the pelvic girdle. Immediately below this paired structure are four reduced radials and posterior to it another fifteen longer radials, making nineteen in all. From the radials arise twenty-nine lepidotrichia which make up the pelvic fin. The base fine of this fin is extended and the
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