230 
8ELACHII. 
Genus ORODUSy Agassiz. 
[Poiss. Foss. vol. iii. 1838, p. 96.] 
An indefinable Carboniferous genus known only by teeth, which 
are not genorically distinguishable from those of the Mesozoic 
llyhodm. The tooth, however, are not associated with other 
remains characteristic of the latter genus, and may thus bo regarded 
as pertaining to a distinct fish. They are laterally elongated, 
having the coronal contour raised mesially, and the surface orna- 
mented by more or loss prominent transverse wrinkles, rising from 
each long margin, or from a median longitudinal crest. The root is 
often much deeper than the crown. 
It is probable that the dorsal fin-spines originally named Gtena- 
cantlius pertain to this genus 
Orodus cinctus, Agassiz. 
1838. Orodus cinctus, L. Agassiz, Poiss. Foss. vol. iii. p. 90, pi. xi. 
figs. 1-4. 
1878. Orodus cinctus, L. G. de Koninck, Faune Calc. Carbf. Belg. pt. i. 
p. 31, pi. iv. fig. 2. 
1883. Orodus cinctus, J. W. Davis, Trans. Roy. Dublin Soc. [2] vol. i. 
p. 392, pi. 1. figs. 8, 9. 
Type. Detached teeth ; Bristol Museum. 
The type species, of medium size. Median coronal prominence 
large, more or loss rounded : longitudinal median ridge rounded, 
nearly even ; transverse ridges and furrows bi’oad and large. 
It is uncertain at present to what extent the rounded character 
of the teeth of 0. cinctus is due to post-mortem abrasion. Excepf; 
in size, the teeth exhibit a very close approximation to those of 
O. ramosns, as already rcm.arked by L. G. do Iloninck and J. W. 
Davis. It seems advisable, however, to retain the species provision- 
ally distinct. 
Form. hoc. Eone-bed of Lower Limestone Shales : Bristol. 
Lower Carboniferous Limestone (Bod I e) : Tournai, Belgium 
P. 2713. Abraded tooth, figured by J. W. Davis, ioc. cit. pi. 1. 
fig. 9. Enniskillen Coll. 
P. 1472. A broken similar, but less abraded tooth. Eyerton Coll. 
■ See especially J. S. Newberry, Rep. Geol. Siirv. Ohio, vol. ii. pt. ii. p. 54. 
A very doubtful tooth from the Lower Carboniferous of Russia is also 
recorded under the name of 0. cinctus by II. Truutschold, Norv. Mem Soc 
Imp. Nat. Moseou, vol. xiv. (1S79), p. .52, pi. vii. lig. 2. 
