On the Fossil Fishes of the Carboniferous Limestone Series of Great Britain. 357 
a variety of forms, not unfrequently presenting the appearance of a hand with 
extended fingers. The tubercles are not more than one-fiftieth of an inch 
in diameter, and are devoid of arrangement. The anterior surface is angular 
and produced in the form of a keel, thickly coated for the most part with bright 
glistening ganoine. Near the base line the anterior keel is broken into two or 
three separate tubercles which bear much of the character of those on the sides of 
the spine, further up the spine the tubercles coalesce and the ganoine extends to 
the point in constantly increasing thickness and breadth, so that on reaching the 
apex the ganoine is equal to the whole diameter of the spine, ending in a bluntly 
rounded point. The posterior surface is deeply channelled by a pulp cavity, 
extending considerably beyond the basal portion towards the apex. The jpostero- 
lateral angles are sharply defined but are devoid of denticles or hooks, 
This spine differs materially from the preceding species, to which it bears a 
superficial resemblance, in the character of its posterior cavity, in the possession 
of a strong anterior keel of ganoine, and in the tubercles which ornament its sides. 
Locality : Carboniferous Limestone, Armagh. 
Ex coll. Karl of Enniskillen. 
Cosmacanthus carbonarius, M‘Coy. 
Cosmacanthus carbonarius—F. M‘Coy, 1848. “Ann. and Mag. Nat. Hist.,” 2nd ser., Vol. 
lOL, jo, LG, 
re e J. Morris, 1854. “Catal. Brit. Foss.,” p. 323, 
Ea . F. J. Pictet, 1854. “Traité de Paléont.,” Vol. IL., p. 287. 
A 5 Morris & Roberts, 1862. “ Quart.Jour.Geol. Soc.,” Vol. X VITT., p. 100. 
+ 5 J. J. Bigsby, 1878. “hes. Devon.-Carb.,” p 351. 
“Spine, nearly straight, semicylindrical ; section semilunate ; sides and anterior 
face broadly rounded in one continuous curve, posterior suleus very wide, rounded ; 
about eight longitudinal rows of small oval tubercles on each side, the tubercles 
nearly touching in each row, and the rows less than their diameter apart; no 
posterior teeth, the posterior sulcus being bounded by the as lateral row of 
tubercles on each side. A fragment, 1 inch 8 lines long and 2} lines wide at the 
narrow end, increases at the rate of nearly two lines in an iho "—(M‘Coy.) 
Professor M‘Coy remarks that this species differs from the Devonian C. malcolin- 
soni, Ag., in its greater size and much more numerous rows of tubercles, Two 
impose specimens were in the collection of Captain Jones, from Armagh. The 
specimens from which the above description was written have either become mis- 
placed or lost : they do not appear to be amongst the types which Boe been preserved 
from the collection of the late Admiral Jones. 
