390 On the Fossil Fishes of the Carboniferous Limestone Series of Great Britain. 
Genus.—Orodus, Agassiz. 
Orodus—L, Agassiz, 1836. “‘ Poissons Foss.,” Vol. JIT., p. 96. 
“Teeth, laterally elongated, having their middle portion more elevated than 
their extremities, forming in the central portion of the tooth an obtuse and trans- 
verse cone : the longitudinal transverse diameter, which much exceeds the transverse 
(here called antero-posterior), is also marked by a ridge sometimes medial, sometimes 
submedial, from which spring oblique secondary ridges which ramify upon the 
sides, and which in the larger teeth, give rise to another series of collateral ridges.” 
The teeth of the fishes of this genus vary greatly in form and; size they may be 
longer or shorter, straight or strongly arched, strong and thick or slender and 
attenuated, with large conspicuous roots or small ones, and in some instances appar- 
ently rootless, and all from the same fish, differmg according to their position in its 
mouth. They appear, nevertheless, to have tolerable persistent similarity in the 
surface decoration of the crown, and this character serves better than any other to 
distinguish the several species. 
The genus Orodus is entirely restricted to the Carboniferous rocks, so far as is 
known. In the British Islands it is found in the Mountain Limestone and Yoredale 
rocks, and may have ascended to the Coal Measures, specimens having been found 
in the shales of the Lancashire coalfield which are attributed to this genus. 
Orodus timidus, H. Trautschold, does not belong to this genus (L. G. de Koninck). 
Orodus ramosus, Agass. 
(GEIG din, ities, 7) 
Orodus ramosus—L, Agassiz, 1836. ‘ Recher. sur les Poiss. Foss.,” Vol. III., p. 97, pl. xi., figs. 5, 
6, 7 and 8. 
bs Sir P. Egerton, 1837. ‘ Catalogue of Fossil Fishes.” 
ss 5 J. E. Portlock, 1843. ‘“ Rep. Geol. of Londonderry, &c.,” p. 467., pl. xiv. a, fig. 8. 
5 . L. G. de Koninck, 1844. “ Disc. der Anim. foss. du terre Carbonif., de la Belg.” 
p- 613, pl. lv., fig. 2. 
3 3 C. G. Giebel, 1848. “ Fauna der Vorwelt,” Vol. I., pt. 3, p. 342. 
x ke H. G. Bronn, 1848. “ Nomencl. Paleont.,” p. 852. 
33 a4 F. Roemer, 1851. “H.G. Bronn’s “ Lethea.,” Vol.I., p. 709, pl. ix., fig. 9. 
a 5 F. A. Quenstedt, 1852. “ Handb. der Petrefact.,” p. 188. 
5 55 F, J. Pictet, 1854, “ Traité de Palxont.,” Vol. I1., p. 264. 
Pr i J. Morris, 1854. “ Cat. of Brit. Foss.,” p. 335. 
33 5 Morris & Roberts, 1862. “ Quart. Journ. Geol. Soc.,” Vol. XVIII, p. 101. 
» 5 H. Rowanowsky, 1864. “ Bul.delaSoc. Imp. ‘des Natur. de Moscou,” p.158, pl. iii, fig. 2 
a i Enniskillen, 1869. “ Alphab. Cat. of Type Spec. of Foss. Fish.,” p. 6. 
» i. H. Trautschold, 1874. “ Die Kalkbrticke von Miatchkowa,” p. 16. 
» ¥ W. H. Bailey, 1875. “ Fig. Charact. Brit. Foss.,” p. 120, pl. xli., fig. 10, 
0 9 F. Roemer, 1876. “ Lethea paleozoica,” pl. xlviii., fig. 8. 
» 9 L. G. de Koninck, 1878. “ Fauna du Cale. Carbonif. de la Belgique,” p. 30, pl.iv., fig. 1. 
» ” J.J. Bigsby, 1878. ‘Thesaurus Devon.-Carb.,” p. 359. 
