50 
8ELACHII. 
Petalodopsis, J. W. Davis (i non W. J. Barkas), Trans. Roy. Dublin 
Soc. [2] Yol. i. 1883, p. 498. 
Teeth as in Petalodus, but having the coronal margin coarsely 
denticulated. 
Ctenoptychius apicalis? Agassiz. 
1838. Ctenoptychius apicalis, L. Agassiz, Poiss. Foss. yol. iii. p. 99, 
pi. xix. fig. 1. 
1841. Ctenoptychius apicalis, E. W. Binney, Trans. Manchester Geol. 
J Soc. yoI. i. p. 169, pi. y. fig. 19. 
1873. Ctenoptychius apicalis , T. P. Barkas, Coal Meas. Palaeont. p. 18, 
pi. i. fig. 21. 
1874. Ctenoptychius apicalis, W. J. Barkas, Monthly Rev. Dental 
Surgery, vol. ii. pp. 443, 482, figs, xiv., xv. 
1874. Petalodus apicalis, W. J. Barkas, tom. cit. p. 538. 
1875. Ctenoptychius apicalis, J.Ward, rProc.l North Staffs. Nat. Field- 
Club, p. 218, fig. 12. 
Type. Detached tooth ; British Museum. 
Teeth with coronal margin acuminate, divided into few (5-9) 
relatively large, smooth, but pointed denticulations; anterior base¬ 
line of the crown slightly curved. In the principal teeth the median 
denticulation is prominent and much the largest. Root markedly 
tumid below, truncate. 
Form. $ Loc. Coal-Measures: Lanarkshire, Scotland; Northumber¬ 
land, Yorkshire, Lancashire, Staffordshire, England. 
P. 496. Type specimen; Silverdale, Staffordshire. Egerton Coll. 
P. 3020, P. 3023. Seven teeth, variously broken and abraded; New 
Ironstone (Rag-mine), Fenton, N. Staffordshire. 
Enniskillen Coll. 
P. 1458, P. 1460-1. Six teeth Fenton. Egerton Coll . 
34995-7, P. 246. Four teeth; Fenton. Purchased , 1860, 1880. 
P. 5167-8. Three portions of teeth ; Fenton. Purchased , 1885. 
46028. Crown of tooth; Longton, N. Staffordshire. 
Presented by John Ward , Esq., 1874. 
P. 3022. Fine tooth ; Harecastle, N. Staffordshire. Enniskillen Coll. 
P. 1459. Tooth; Lowmoor, Yorkshire. Egerton Coll. 
P.3021. Three teeth; Carluke, Lanarkshire. Enniskillen Coll. 
21423. Tooth; Carluke, Purchased, 1847. 
