22 RAMSAY H. TRAQUAIR’S 
remarkable for the clear and distinct manner in which the scale-markings are 
exhibited, and these consist of the same fine and comparatively distant ridges 
seen in the other specimens. Scarcely anything of the head remains, but a 
part of the anterior dorsal fin is present, its rays being, as usual, articulated 
towards their terminations. 
Remarks.—As assuredly the above described Calacanthus cannot be 
identified with any Permian or Secondary species, and as the American 
Carboniferous species seem to be closely allied to Ceelacanthus lepturus, Ag., 
it is only necessary to compare it with the latter, and with Cwlacanthus 
Phillipsi, Ag., and Colacanthus elongatus, Huxley. Of these Calacanthus 
Phillipsii is founded upon a large tail from the Carboniferous rocks of Halifax, 
Yorkshire, and is well distinguished by its large rounded scales.* Calacanthus 
elongatus, from the Coal Measures of Ballyhedy, County Cork, Ireland, is 
described by Professor Huxtrey as having a more elongated head than the 
other species, and the impressions of the bones of the skull present “ traces of 
a minutely granular or lineated sculpture.”t Celacanthus lepturus, whose 
characters, external and internal, are best known to us, have the exposed 
surface of its scales extremely closely striated, while the external cranial bones 
are everywhere covered by a very well-marked ornamentation, consisting 
of close, fine, yet sharply defined wavy and tortuous ridges and granules, which 
we search for in vain on the skull of Celacanthus Hualeyi, where, on the other 
hand, the head bones are mostly smooth, or as in the case of the angular 
element of the mandible, marked only with a few comparatively coarse distant 
and prominent ridges. 
I take the liberty of dedicating this species to Professor HuxLey, to whose 
researches ichthyological science is so much indebted for a more correct 
insight into the definition and structure of the Ccelacanthide. 
Suborder ACIPENSEROIDEIL. 
Family PALAOoNIScIDz. 
Genus Elonichthys, Giebel, 1848. 
(Giebel, Fauna der Vorwelt, vol. i. pt. 3, p. 249; Traquair, Carboniferous Ganoids, p. 47 ; 
and Quar. Journ. Geol. Soc. London, vol. xxxiii. 1877, p. 553,) 
Elonichthys serratus, sp. Noy. 
Pl. I. figs. 5-8. 
Two specimens only of this interesting form are contained in the Survey Col- 
lection, and both are unfortunately not quite perfect. The larger (fig. 6) measures 
'* Agassiz, Poissons Fossiles, vol. ii. pt. 2, p. 173. 
+ Huxley, Dec. Geol. Survey, vol. xii. p. 24. 
