CESTRACIOXTLDiE. 
231 
P. 2713 a. Two fragments of small, much elongated teeth. 
Enniskillen Coll. 
P. 5863. Two small, much elongated teeth. 
P. 2677. Two small teeth, naturally associated, with prominent 
longitudinal crest, probably of this species. 
Enniskillen Coll. 
Orodus ramosus, Agassiz. 
1838. Orodus ramosus , L. Agassiz, Poiss. Foss. vol. iii. p. 97, pi. xi. 
figs. 5-8. 
1838. Helodus subteres, L. Agassiz, tom. cit. p. 105, pi. xii. figs. 3,4. 
1844. Orodus ramosus , L. G. de Koninck, Descr. Anim. Foss. Terr. 
Carbf. Belg. p. 613, pi. lv. fig. 2. 
1875. Orodus ramosus , W. H, Baily, Figs. Oharact. Brit. Foss. p. 120, 
pi. xli. fig. 10. 
1876. Orodus ramosus , F. Roemer, Leth. Pakeoz. pi. xlviii. fig. 8. 
1878. Orodus ramosus, L. G. de Koninck, Faune Calc. Carbf. Belg. 
pt. i. p. 30, pi. iv. fig. 1. 
1883. Orodus ramosus, J. W. Davis, Trans. Boy. Dublin Soc. [2] 
toI. i. p. 390, pi. L.figs. 1-7. 
1883. Orodus subteres, J. W. Davis, tom. cit. p. 399, pi. li. fig. 15. 
Type. Detached teeth; British Museum (in part). 
A very large species, the teeth sometimes attaining a length of 
0-1. Dental crown gently raised to a transversely angulated, more 
or less median eminence; the elongated lateral portions with a 
sharp, low, wavy longitudinal ridge, rarely mesially placed, but 
commonly much nearer to one side than to the other. The coronal 
surface is wrinkled by a numerous series of branching angulated 
ridges, sometimes crenulated, extending transversely from the low 
longitudinal crest. 
The so-called Helodus subteres may be regarded as a much 
abraded tooth of this species. The Russian teeth described by 
Romanowsky 1 and Trautschold 2 as O. ramosus are very doubtfully 
determinable as such ; and the same may be said of the tooth from 
Hook Point, Wexford, figured by Portlock 3 . 
Form. S>' Loc. Lower Carboniferous Limestone : Somersetshire, 
Gloucestershire, and Belgium. Carboniferous Limestone : Shropshire 
and Monmouthshire. 
1 Bull. Soc. Imp. Rat. Moscou, 1864, pt, ii. p. 158, pi. iii. fig. 2. 
2 Rouv. Mem. Soc. Imp. Rat. Moscou, vol. xiii. (1874), p. 292, woodcut. 
3 Bep. Geol. Londonderry (1843), pi. xiv a. fig. 8. 
