﻿144 ICHTHTODORULITES. 



It still remains uncertain whether the small spine from the 

 Middle Coal-Measures of Tingley, Yorkshire, described under the 

 name of G. daiticitlatus, Davis l , is not the unworn spine of the 

 young of G. fonnosus, as described by 11. H. Traquair 2 . The 

 following specimen is of the same form, but only one posterior 

 series of denticles is displayed : — 



P. 2289. Nearly complete spine Olo in length, unornamented for 

 a distance of 0*045 from the apex ; Coal-Measures, Govan, 

 near Glasgow. Presented by George Griffiths, Esq., 1882. 



The small spine from the Calciferons Sandstone Series of Burdie- 

 house, near Edinburgh, figured by S. Hibberfc, Trans. Roy. Soc. 

 Edinb. vol. xiii. (1835), pi. xi. fig. 1, and assigned to Gyracanthus 

 fonnosus by Agassiz (torn. cit. p. 17), is of doubtful species. The 

 following are of a similar type : — 



P. 6236. Basal fragment of a large spine ; Burdiehouse. 



Purchased, ]847. 



P. 2243. Broken small spine ; Burdiehouse. Egerton Coll. 



P. 3146. Less imperfect small spine ; Burdiehouse. 



Enniskillen Coll. 



The following species have also been described, but there are no 

 examples in the Collection : — 



Gyracanthus alleni, J. S. Newberry, Rep. Geol. Surv. Ohio, vol. i. 



pt. ii. (1873), p. 331, pi. xxxvii. fig. 3. — Waverly Group 



(Cuyahoga Shale) ; Ohio. [Columbia College, New York.] 

 Gyracanthus compressus, J. S. Newberry, ibid. p. 330, pi. xxxvii. 



figs. 1, 2. — Waverly Group; Ohio and (?) Indiana. 



[Columbia College, New York.] 

 Gyracanthus duplicatus, J. "W. Dawson, Acadian Geol. 2nd edit. 



(1868), p. 210, woodc. fig. 55 ; J. S. Newberry, Palseoz. 



Fishes N. America (Mon. U. S. Geol. Surv. no. xvi. 1889), 



p. 124. — Coal-Measures ; Nova Scotia. [Redpath Museum, 



Montreal.] 

 Gyracanthus incurvus, R. H. Traquair, Geol. Mag. [3] vol. vii. 



(1890), p. 21. — Lower Devonian; Campbellton, P. Q., 



Canada. [Edinburgh Museum.] 



1 J. W. Davis, Ann. Mag. Nat. Hist. [5] vol. vi. (1880), p. 373, woodcut. 



2 Ann. Mag. Nat. Hist. [5] vol. xiii. (1884), p. 40 



