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Proceedings of the Royal Society 
inequilobate. The anterior rays of the lower lobe have, for a con- 
siderable extent of their length, their transverse articulations more 
distant than those of its other rays and of the whole upper lobe, in 
which the joints are very short. 
Remarks. — This species closely resembles E. striolatus , but is 
distinguishable from it by the very short and deep form of the body, 
and the more largely developed median fins, of which the dorsal is 
especially striking, from its great size. Although fully aware of 
the danger, in dealing with Palaeozoic fishes, of defining or founding 
species upon proportional measurements, yet, seeing that, as already 
observed, there seems to be no evidence that the present specimen 
has undergone any material change of form by post mortem 
processes, I have, after due consideration, thought it best to bestow 
upon it a new specific designation. 
Geological Position and Locality. — From Burdiehouse, in lime- 
stone of the calciferous sandstone series. 
Elonichthys Bucklandi , Agass. sp. 
Pygopterus Bucklandi, Agassiz, “Poissons Fossiles,” vol ii. pt. !2, p. 77 (1835). 
,, ,, Hibbert (Agassiz), Trans. Roy. Soc. Ed., vol. xiii, 
pp. 216-217, pi. vii. fig. 2 (1834-35). 
I have not seen the original type of this species, figured by Dr 
Hibbert in his celebrated memoir on the Burdiehouse limestone, and 
stated by Agassiz to be in the collection of the Koyal Society of 
Edinburgh. This may, indeed, have been a mistake, and the 
specimen may possibly have been in the private collection of Dr 
Hibbert, now unfortunately dispersed. From Hibbert’s figure, 
however, and the very brief notice of this species in the “ Poissons 
Fossiles,” I feel pretty confident in referring to it a number of 
mostly fragmentary remains of a large Palseoniscoid fish from Burdie- 
house contained in the Edinburgh Museum of Science and Art. 
The only entire specimen I have seen is 11-|- inches in length. It 
is, most unfortunately, crushed on its back. It displays, however, 
the right pectoral and ventral fins. The former has its principal 
rays articulated throughout ; the ventral is of moderate size. The 
median fins are large. The dorsal is not shown in any of the 
specimens belonging to the Edinburgh Museum, but in Dr Hibbert’s 
figure it is seen to resemble the anal, and is evidently placed nearly 
