On the Fossil Fishes of the Curboniferous Limestone Series of Great Britain. 421 
Cochhodus contortus, Agass. 
(PI. LIL, figs. 1-6) 
Psammodus contortus—L. A gassiz, 1833. “ Rech. sur les Poiss. Foss. ” Vol. III., pl. xiv., 
figs. 16-33, and pl. xix., fig. 14. 
s A Sir P. Egerton, 1837. ‘Cat. of Foss. Fish.” 
Cochliodus, L. Agassiz, 1838. “ Poiss. Foss.” Vol. IIT., p. 115. 
F % R. Owen, 1840. “ Odontography,” Vol. IT., p. 10, pl. xxii., fig. 1. 
Pr 55 J. E. Portlock, 1843. “Rept. on Geol. Fermanagh, &c.,” p. 466. 
- ¥ H. B. Geinitz. 1845. ‘“ Versteinerungsk,” p. 165. 
Ps 5 C. G. Giebel, 1848. ‘“ Fauna der Vorwelt,” Vol. L., pt. iii., p. 336. 
55 H. G. Bronn, 1848. “ Nomencl. Palxont.,” p. 317. 
+5 , % 1849. “ Enumerator Paleont.,” p. 647. 
“3 .) F, A. Quenstedt, 1852. “ Hanb. der Petrefaktenk. p. 188. 
3 5 J. Morris, 1854. “Cat Brit. Foss.,” p. 322. 
3 % F. J. Pictet, 1854. “Traité de Paléont.,” Vol. II., p. 267, pl. 33.,fig. 31. 
a ; F. M‘Coy, 1855. “Brit. Paleoz. Foss.,” p. 622. 
* iS F. Roemer, 1856. “In. Bronn Lethea geogn.,” Vol. I., p. 708, 
pl. ixd., fig. 4. 
3 3 F. d’Eichwald, 1860. “ Lethea. rossica.,” Vol. I., p. 1547. 
Morris and Roberts, 1862. ‘ Quart. Jour. Geol. Soc.,” Vol: XVIIL., p. 100. 
H. Rowanowsky, 1864. “ Bull.d.1. Soc. Imp. des. Nat. de Moscou., p. 159 
pl. iii., figs. 7-10. 
op 5 R. Owen, 1867. ‘Geological Magazine, Vol. IV., p. 59. 
¥ 3 Enniskillen, 1869. ‘Cat. of Type Spec. Foss. Fishes,” p. 4. 
3 op Young & Armstrong, 1871. “Trans. Geol. Soc., Glas.,” Vol. III., Spt., p. 70. 
% 3 H. A. Nicholson, 1872. “Man. of Paleont.,” p. 339, fig. 297. 
. 3 F. Roemer, 1876. ‘ Lethea Paleoz. Atlas,” pl. xlviii., fig. 5. 
9 5 Armstrong, Young, | 
& Robertson, 1876. ‘Cat. W. Scot. Foss.,” p. 61. 
5 3 J. J. Bigsby, 1878. “Thesaurus Devonio.-Carb.,” p. 349. 
5p 53 L. G. de Koninck, 1878. “ Fauna du Cale. Carb. de la Belgiqve.,” p. 57, 
pl. vi., fig. 14. 
Teeth, sides of jaw and lateral rows of teeth converging at an angle of about 60°. 
Posterior tooth oblong, obliquely truncated on the outer side of the posterior end to 
form the posterior point; posterior edge rather abraptly raised to form the posterior 
oblique ridge behind, sloping into a rather deep oblique hollow, which defines 
the middle oblique ridge, which is much the most prominent and strongly rounded 
of the three ; anterior ridge coinciding with the anterior margin, very slightly raised, 
little tumid, separated by a moderate concavity from the steeply rounded side of 
the middle ridge, and forming an angle of §0° with the outer margin. Second tooth 
narrow, its posterior half very convex, forming a prominent, rounded ridge, rising 
abruptly from the posterior margin, but sloping sigmoidally to the anterior margin, 
which is not again relieved. Anterior teeth unknown, surface either smooth or 
