CARBONIFEROUS FISH-FAUNA, 
Euthacantkus by Powrie 1 . The resemblance, however, does not 
necessarily imply any close affinity. The tins must be dis- 
covered before the precise systematic position of this fish can be 
determined. 
Eupleukogmus cresswelli, McCoy. Plate V., fig. 4. 
1890. Eupleurogmus cresswelli , E. McCoy. Loc. cit., p. 24. 
Type . — Portion of squamation (PI. V, fig. 4). 
Description of Specimen . — As shown by the figure, which is 
of the natural size, this must have been a rather large 
Acanthodian ; but it is only known by scattered remains of the 
scales and a fractured fin-spine of one individual. Many of the 
scales of the flank are in undisturbed order and exhibit their 
regular arrangement. They are square and apparently solid, 
with a smooth outer face. Immediately above and below the 
course of the lateral line, two of them are fused into an elongated 
scale; the upper fusion being of scales in contiguous transverse 
series, while the lower fusion affects two scales of one and the 
same series, the result being that the enlarged scales are disposed 
chevron-wise, pointing forwards. At the lower left-hand corner 
of the figure the tip of a fin-spine is represented. The adjoining 
part of the fossil exhibits the remainder of this spine, which is 
only seen in longitudinal section. It is as stout and straight as 
some of the fin-spines of the Lower Devonian Euthacantkus, and 
has a large internal cavity. 
Subclass DIPNOI. 
Order Sirenoidei. 
Family CTENODONTIDMk 
Genus Ctenohus, Agassiz. 
[Pe^li. Poiss. Foss., vol. iii., 1838, p. 137.] 
The characteristic cranial roof and scales of this typically 
Permo-Carboniferous genus occur in the collection from Mans- 
field, and permit its identification with certainty. 
1 J. Powrie, Quart. Journ. Geol. Soc., vol. xx. (1864), p. 425. 
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