On a Labyrinthodont Skull from the Kilkenny Coal-measures

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Abstract
In going through the collection of Labyrinthodont remains from the Coal-measures of Jarrow Colliery, Co. Kilkenny, preserved in the Science and Art Museum, Dublin, I noticed a fragment of shale showing the lower jaw of a Labyrinthodont, which appeared to indicate a species different from any of those hitherto described from these beds. The slab in which the specimen is contained is of a slaty nature, without any of the pyritous matter which is so frequently fatal to the permanent preservation of the Jarrow fossils. On. examination it appeared that by splitting the fragment the upper surface of the skull might also be revealed; and this operation fortunately proved successful. Whereas, however, the external sculptured layer of the bones of the lower jaw is exposed, in the case of the cranium the line of fission has traversed a film of shale overlying the bones, and it has only been practicable to remove this film so as to expose the sculptured surface in the left postorbital region. As is the case with all the Jarrow fossils, the specimen has been completely flattened by pressure; but, although the width of the cranium has been doubtless thus slightly increased, the general contour is fairly well exhibited. The outline of the right side of the cranium is, indeed, in great part destroyed, owing to the reflection of its maxillary border on to the inferior surface of the slab. On the left side of the cranium the contour is, however, entire. The extremity of the

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