404 On the Fossil Fishes of the Carboniferous Limestone Series of Great Britam. 
Lophodus leevissimus, Agassiz (sp.) 
(Pl. LI, figs. 18, 18a, 180, 18c.) 
Psammodus levissimus—L. Agassiz, 1833. “ Poiss. Foss., ”- Vol. III, pl. xiv., figs. 1-11. 
5 3 Sir. P. Egerton, 1837. “Catal. Foss. Fishes.” 
Helodus op LL. Agassiz, 1838. “ Poiss. Foss.,” Vol. IIL. p. 104. 
, A J. E. Portlock, 1843. “Report on Londonderry, &ec.,” p. 461. 
_L. G. de Koninck, 1844. ‘Disc. des Anim. Foss. du terre Carb. de 
Belg.,” p. 614, pl. lv., fig. 3, (pl. liii., 
fig. 9, excluded). 
> % C. G. Giebel, 1848. “Fauna der Vorwelt,” Vol. I., pl. 3, p. 340. 
5 %p H. G. Bronn, 1848. ‘Nomencl. Paleont.,” p. 583. 
Ms * - 1849. “ Enumerator Palont.,” p. 647. 
ss 3 J. Morris, 1854. “Cat. Brit. Foss.,” p. 328. 
AS - F. J. Pictet, 1854. “Traite de Paleont.,” Vol. IL, p. 267. 
i 5 F. M‘Coy, 1855. ‘Brit. Paleoz. Foss.,” p. 630, pl. iii., fig. 17. 
be 55 E. @’ Eichwald, 1860. “‘ Lethzea rossica.,” Vol. I., p. 1546. 
‘ ss J. Morris and Roberts, 1862. ‘Quart. Journ. Geol. Soc,” Vol. XVIII, 
p- 100. 
Young and Armstrong, 1871. “Trans. Geol. Soc. Glasgow,” Wol. III., 
p- 100, Supt. p. 72. 
J. J. Bigsby, 1878. “Thesaurus Devonico.-Carb.,” p. 357. 
L. G. de Koninck, 1878. “Fauna du Cale, Carbonif. de la Belgique,” 
Lophodus » 
p. 33, pl. iv., fig. 6. 
Teeth, small ; transverse diameter equal to three times the antero-posterior one ; 
crown elevated into a simple obtuse cone, of which the base occupies the centre of 
the tooth; the crown is gradually depressed and tapers from the central cone to 
the extremities, which are feebly truncated. Surface uniformly punctate or smooth. 
The root is slightly less in depth than the height of the crown and thinner, it is 
directed obliquely forwards, and separated posteriorly from the crown by a small 
eroove. The inferior surface of the root is slightly concave. It is composed of a 
coarsely striated, bony structure. 
The specimens figured by Agassiz (Rech, sur les Poiss. Foss.,” Vol. IIL, 
pl. xiv., figs. 1-1 1) belong in all probability to this species, the remaining figures 
do not. 
Formation and locality : Mountain Limestone, Armagh. 
Ex coll. Earl of Enniskillen. 
