Fossil Fish in Rocks of the Mansfield District. 11 



so that the whole of this portion of jaw can be inspected — • 

 one, showing twenty teeth of a conical shape, fi"om one- 

 quarter to three-eighths of an inch in height ; the other, 

 with a large double-pointed tooth with the apices missing, 

 still about one inch by half an inch thick at the base, and 

 one inch and three-quarters high, having portions of other 

 much smaller teeth adjoining it. Also some constricted 

 bones of various size from one inch to two inches in length 

 — " probably hyoid bones of large fish " — and some long, 

 fine, cylindrical bony spines, like detached branchiostegal 

 rays have been found. 



R. — This is the bed before referred to, as being the first 

 in which I found the approximately complete fossil fish, 

 Gosmolepides siveeti. From this bed, also, a sufficient 

 number of specimens were obtained, to enable the whole of 

 the parts to be fully made out. Conspicuous in this bed are 

 the bi-lobed pittings everywhere observed, and covering 

 every leaf of shale. It is here, also, that we find the first 

 plant impressions in situ, lying in the same plane of bedding 

 as the fish, and one or two specimens exhibiting unmistak- 

 able Lepidodendron characters. They are, however, of 

 comparatively small size. 



This bed has also yielded several specimens of a pitted 

 structure like Bothriolepis, but in reality Botlirioholus 

 (McCoy), but of different nature (Professor McCoy thinks it 

 possibly ova, but its structure has not yet been made out). 

 These are seen of large size, one beino- seven inches wide, nine 

 inches long, and one and a half inches thick, but incomplete 

 in length ; and a shield-like form, about ten inches long by 

 five inches broad (nearly perfect). Also several conical teeth 

 like those before mentioned, from half an inch to an inch in 

 length, with large plates retaining their bony structure, prob- 

 ably GepJialasjndan. Some others resembling, at a cursory 

 glance, oblong shells ; and the large scales, probably of 

 Glyptolepis, were here obtained ; also a portion of fish allied 

 to Sca])haspis, and specimens of an Acanthoid fish. Another 

 Acanthoid fish was obtained from here, about ten inches in 

 length in its incomplete state, but it has apparently been 

 about fourteen inches when the whole of the tail was intact. 

 This shows most of the fins,retaining their bony spines in situ, 

 and it is considered by Professor McCoy a very interesting 

 specimen. He has in honour of Mr. Langtree, the energetic 

 Secretary for Mines, named it Lhiraiapolus langtrei. Some 

 large gill-like plates, with radiating fibrous tissue, were 



