﻿260 SIRENOIDEI. 



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 Colliery, 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, R. H. Traquair, Geol. 



Mag. [2] vol. x. p. 543. 

 1890. Hemictenodus quinquecostatus, R. II. Traquair, ibid. [3] vol. vii. 



p. 251. 

 1890. Sagenodus quinquecostatus, R. H. Traquair, Proc. Roy. Soc. 



Edinb. vol. xvii. p. 387. 



Type. Dental plate ; collection of Dr. R. 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. 



Fornt. <$f Loc. Middle Carboniferous Limestone (Blackband 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, R. H. Traquair, Geol. Mag. [2] vol. viii. 

 p. 36 (Ctenodus). — Middle Carboniferous Limestone (Black- 

 band Ironstone); Borough Lee, near Edinburgh. [R. H. 

 Traquair Coll.] 



Sagenodus applanatus, A. Eritsch, Fauna der Gaskohle, vol. ii. 

 (1888), p. 85, pi. lxxii. figs. 1-3 (Ctenodus). — Lower 

 Permian ; Kounova, Bohemia. [Royal Bohemian Mus.] 



Sagenodus carbonarius, H. Romanowsky, Bull. Soc. Imp. Nat. 

 Moscou, 1864, pt. ii. p. 163, pi. iv. fig. 27 (Ceratodus). — 

 Lower Carboniferous ; Govt, of Toula, Russia. 



Sagenodus caudatus, W. J. Barkas, Proc. Roy. Soc. N. S. Wales, 

 vol. x. (1877), p. 109, fig. 9 ( Ctenodus).— Coal-Measures ; 

 Northumberland. [W. J. Barkas Coll.] 



