112 
ICHTHY0D0RT7LITES. 
Cosmacanthus marginalise Davis. 
1883. Cosmacanthus marginalis, J. W. Davis, Trans. Roy. Dublin Soc. 
[2] vol. i. p. 355, pi. xlviii. fig. 3. 
Type. British Museum. 
Form. Sf Log. Lower Carboniferous Limestone: Armagh, Ireland. 
P. 2894. Type specimen. Enniskillen Coll. 
P. 2894 a. More complete but much abraded and broken spine. 
Enniskillen Coll. 
Cosmacanthus carinatus 9 Davis. 
1883. Cosmacanthus carinatus, J. W. Davis, Trans. Roy. Dublin Soc. 
[2] vol. i. p. 356, pi. xlviii. fig. 4. 
Type. British Museum. 
Form. Sf Log. Lower Carboniferous Limestone : Armagh. 
P. 2893. Type specimen. Enniskillen Coll. 
Cosmacanthus prisons (M‘Coy). 
1843. Leptacanthus priscus , L. Agassiz, Poiss. Foss. vol. iii. p. 176 
(name only). 
1848. Nemacanthus priscus, F. M‘Coy, Ann. Mag. Nat. Hist. [2] vol. ii. 
p. 120. 
1883. Cosmacanthus prisms, J. W. Davis, Trans. Roy. Dublin Soc. [2] 
vol. i. p. 358, pi. xlviii. figs. 1, 2. 
Type . Geological Society of London. 
Form. Sf Log. Lower Carboniferous Limestone : Armagh. 
P. 2237. Fragment of spine. Egerton Coll. 
The following species have also been describe'd, but there are no 
examples in the Collection :— 
Cosmacanthus bullatus : Geiscicanthus bullatus , St. John &Worthen, 
Pal. Illinois, vol. vi. (1875), p. 441, pi. xvii. figs. 3, 4.— 
Lower Chester Limestone ; Illinois. 
Cosmacanthus carboncirius, F. M‘Coy, Ann. Mag. Nat. Hist. [2] 
vol. ii. (1848), p. 119 ; J. W. Davis, Trans. Roy. Dublin 
Soc. [2] vol. i. (1883), p. 357.—Lower Carboniferous 
Limestone; Armagh. 
Cosmacanthus malcolmsoni, L. Agassiz, Poiss. Foss. Yieux Gres 
Rouge (1845), p. 121, pi. xxxiii. fig. 28^—Upper Old Red 
Sandstone: Scat Craig, Elgin, Scotland. [The type 
S ' species; collection of James Powrie, Esq., Reswallie.j 
