260 
SIREXOIDEI. 
The following specimens are specifically undetermined :— 
41851. Impression of a palatine dental plate with six or seven 
radiating ridges arranged like those of S. incequalis ; Coal- 
Measures, Jarrow Collier}^ Kilkenny. 
Purchased , 1870. 
41851 a. Much abraded dental plate showing five widely-spaced 
radiating coronal ridges; Kilkenny. Purchased, 1870. 
Sagenodus quinquecostatus, Traquair. 
1883. Ctenodus obliquus, var. quinquecostatus, B. H. Traquair, Geol. 
Mag. [2] vol. x. p. 543. 
1890. Hemictenodus quinquecostatus , It. 11. Traquair, ibid. [3] vol. vii. 
p. 251. 
1890. Sagenodus quinquecostatus , It. H. Traquair, Proc. Boy. Soc. 
Edinb. vol. xvii. p. 387. 
Type. Dental plate; collection of Dr. It. H. Traquair. 
A smaller species than the type, the dental plates having not 
more than five complete ridges. 
Imperfect skeletons of this fish are known, but not yet described. 
They are briefly noticed by Traquair, who remarks that the cranial 
roof-bones are shown to be arranged as in S. incequalis. 
Form. Sf Loc. Middle Carboniferous Limestone (Blaekband Iron¬ 
stone) : Borough Lee, near Edinburgh. 
Not represented in the Collection. 
The species mentioned below have also been founded upon dental 
plates, but the distinctness of some from those recorded above still 
remains doubtful. 
Sagenodus (?) angustulus, K. H. Traquair, Ceol. Mag. [2] vol. viii. 
p.36 (Ctenodus). —Middle Carboniferous Limestone (Black- 
band Ironstone); Borough Lee, near Edinburgh. [K. H. 
Traquair Coll.] 
Sagenodus appdanatus , A. Eritsch, Eauna der Gaskohle, vol. ii. 
(1888), p. 85, pi. lxxii. figs. 1-3 (Ctenodus). —Lower 
Permian ; Kounova, Bohemia. [Boyal Bohemian Mus.] 
Scigenocius carbonarius , D. Bomanowsky, Bull. Soc. Imp. Nat. 
Moscou, 1864, pt. ii. p. 163, pi. iv. fig. 27 (Ceratodus). — 
Lower Carboniferous ; Govt, of Toula, Bussia. 
Sagenodus cauclatus , W. J. Barkas, Proc. Boy. Soc. N. S. Wales, 
vol. x. (1877), p. 109, fig. 9 (Ctenodus). —Coal-Measures ; 
Northumberland. [W. J. Barkas Coll.] 
