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Appendix I. 



On a New Species of Acbolepis obtained by Mr. Molyneux from 

 the Sengwe Coalfield. By Arthur Smith Woodward, LL.D., 

 F.R.S., F.L.S., F.G.S. 



[Plate XX.] 



The large slab of ferruginous sandstone obtained by Mr. Molyneux 

 from the Sengwe Coalfield exhibits the imperfect remains of five 

 ganoid fishes, besides scattered fragments probably of others, all 

 belonging to the same species. One specimen (PI. XX, fig. 1) 

 indicates the approximate length of the head, two others seem 

 to show the maximum depth of the trunk, while another displays 

 the greater part of the heterocercal tail (PL XX, fig. 2). All the 

 specimens exhibit the scales, and there are also some traces of the 

 paired and anal fins. It is thus possible to determine many of 

 the characters of the genus and species represented. 



The fish to which these remains belong is laterally compressed, 

 and must have measured at least 60 centimetres in length, with a 

 maximum depth of about 15 centimetres. The length of the head 

 with opercular apparatus seems to have been approximately equal to 

 the maximum depth of the trunk. The caudal pedicle is clearly very 

 slender, and the upper caudal lobe is much elongated (PI. XX, fig. 2). 



The external head-bones are ornamented with thick rounded 

 ruga3, but they are crushed together beyond recognition. The 

 direction of the mandibular suspensorium is very oblique. 



The enamelled scales are thick, rhombic in shape, and regu- 

 larly arranged over the whole of the trunk. They are very deeply 

 overlapping ; and those of the flank are united by a peg-and-socket 

 articulation, without any strengthening ridge on the inner face 

 (PI. XX, fig. 4). The principal scales of the flank in the abdominal 

 region (PL XX, fig. 3) are not deeper than broad, and their rhombic 

 outline is slightly modified by a sigmoidal curve of the upper and 

 lower margins. The thick enamel of their exposed face is sculptured 

 with grooves, which separate about eight or nine rounded, hori- 

 zontally-directed ridges, and these terminate at the hinder margin of 

 each scale in coarse deep pectinations. The uppermost ridge is the 



