406 On the Fossil Fishes of the Carboniferous Limestone Series of Great Britain. 
Lophodus mammillaris, Agass, (sp.) 
(Pl. LL, fig. 20.) 
Helodus mammillaris—L. Agassiz, 1838. “ Poissons Fossiles,” Vol. 1IL, pp. 173 and 383. 
5 no J. E. Portlock, 1845. “ Rept. Geol. Londonderry,” p. 461. 
3 3 C. G. Giebel, 1848. “Fauna der Vorwelt,” Vol. I., pt. 3, p. 341. 
> is H. G. Bronn, 1848. ‘Nomencl. Paleont.,” p. 583. 
“i 5 A 1849. “ Enumerator Paleont.,” p. 647. 
35 - J. Morris, 1854. ‘Cat. of Brit. Foss.,” p. 328. 
5 55 F. J. Pictet, 1854. ‘Traite de Paléont ,” Vol. II., p. 267. 
5 5 F. M‘Coy, 1855. ‘Brit. Paleeoz. Foss.,” p. 631, pl. 3 I., fig. 16. 
rr 5 Morris and Roberts, 1862. “ Quart. Journ. Geol. Soc.,” Vol. X VITI., p. 100. 
» . Young & Armstrong, 1871. “ Trans. Geol. Soe. Glasgow,” Vol. IIT.,Supt., p.72. 
mt . J. J. Bigsby, 1878. “Thesaurus Devon Carb.,” p. 357. 
Lophodus _,, L.G. de Koninck, 1878. “ Fauna du Cale. Carb.,” p. 35, pl. iv., figs. 9, 10, 
Wil. 
Teeth, “crown very much elongated, narrow, abruptly pointed at each end, 
having a moderately large, rounded, abruptly-tumid gibbosity, rather nearer to one 
end than the other, and sometimes having an obscure bead-like projection, with an 
underlying vertical area, over one of the long lateral margins ; short end even and 
pointed ; long end with one or two very faint, small, secondary gibbosities. Surface 
of the large prominent boss coarsely granulo-punctate, the punctations being finer, 
and often obscured by a polished surface of ganoine on the ends. Average length 
seven lines, greatest width two lines, height of crown one and a half lines.”— 
(M‘Coy.) 
M. de Koninck in describing this species gives as a characteristic distinguishing 
it, the possession of two small pointed tuberosities, one in front of, and the other 
behind, the basal portion of the median cone ; these he regards as separating the 
species from. Lophodus gibberulus and L. (Orodus) subteres, which offer no trace of 
such tubercles. Professor M‘Coy considers that this species may be found 
eventually to belong to either one or other of the species named, or that the three 
may be only one species. There appears no reason to doubt that M. de Koninck 
is correct. 
The specimens were named by Professor L. Agassiz, it being his intention to describe 
them in a supplement. The latter unfortunately never appeared. 
Formation and locality: Mountain Limestone, Bristol and Armagh. 
He coll. Ear] of Enniskillen. 
