. Bulletin of the British Museum (Natural History), Geology. 238 PALAEOZOIC CORAL FAUNAS Description. Small, broadly trochoid coral with smooth, sUghtly worn exterior. Calice not seen. A single section at the ephebic stage shows the lumen largely infilled by thick septa arranged with striking pinnate symmetry. The septa are mostly between I and 1-4 mm in thickness peripherally. The counter and alar septa are longest, all three meeting in the axis. In the counter quadrants, the counter-lateral and next four metasepta are roughly equal in length and about three-quarters the length of the counter
. Bulletin of the British Museum (Natural History), Geology. 238 PALAEOZOIC CORAL FAUNAS Description. Small, broadly trochoid coral with smooth, sUghtly worn exterior. Calice not seen. A single section at the ephebic stage shows the lumen largely infilled by thick septa arranged with striking pinnate symmetry. The septa are mostly between I and 1-4 mm in thickness peripherally. The counter and alar septa are longest, all three meeting in the axis. In the counter quadrants, the counter-lateral and next four metasepta are roughly equal in length and about three-quarters the length of the counter septum. The fifth and subsequent metasepta in the counter quadrants become progressively shorter and more wedge-shaped against the alar septa. On the cardinal side of the alar septa the first two metasepta are equal in length to the alar septa and the subsequent metasepta become progressively shorter and more wedge-shaped round towards the cardinal septum. The wall of the cardinal fossula appears to be the result of sclerenchyme coating the successive ends of the metasepta in the cardinal quadrants and is not formed by extra long metasepta flanking the short, 3*5 mm long, cardinal septum. Very narrow gaps, about o-i mm wide, separate the major septa in the peripheral area of the coraUum. In several places the gaps are crossed by narrow bars that are probably tabulae. There are short triangular minor septa, about i mm long, inserted between nearly all the major septa. The septal formula is C6A8KyA8C at a mean diameter of 13 mm. No longitudinal section is available. Discussion. The general characters of this coral agree with those of the genus Hadrophyllum although it cannot be readily assigned to any described species. Comparison is made difficult as virtually no other species of Hadrophyllum has been. Fig 4. Septal arrangement in//cK^ro/i/j^/Z/Mm sp. (R49275). X5. C = cardinal septum; K = counter septum; A = alar Please note that these images are extracted from scanned
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