442, On the Fossil Fishes of the Carboniferous Limestone Series of Great Britain. 
(Pl. LIL, figs. 20-23.) 
Peecilodus jonesii— L. Agassiz, 1838. “ Rech. Poiss. Foss.,” Vol. III., p. 174 (indet). 
% transversus, 5 1838. is A - Vol. IIT., p. 174 (indet). 
as jonesii— J. E. Portlock, 1843. “ Rept. Geol., Londonderry, &e.,” p. 468, pl. 14a, fig. 6. 
- transversus, * 1843. 3 5 p. 468, pl. 14a, fig. 7. 
p jonesii— C. G. Giebel, 1848. ‘Fauna der Vorwelt,” Vol. L., pt. 3, p. 337. 
e transversus, - 1848. 5 . “4 Vol. L., pt. 3, p. 337. 
% jonesu— H. G. Bronn, 1848. ‘“ Nomencl. Paleont.,” p. 1022. 
transversus, 3 1848. 5 a p- 1022. 
. jonesu, - 1849. “‘Enumerator Paleont.,” p. 647. 
5 transversus, s 1849. - 5 p. 647. 
: jonesii— J. Morris, 1854. “Catal. Brit. Foss.,” p. 340. 
_ transversus, 5 1854. “4 3 5 jd edd) 
3 jonesii— F. J. Pictet, 1854. “Traité de Paléont.,” Vol. II., p. 270. 
5 transversus, r 1854. eee, - Vol. IL., p. 270. 
¥s jonesii— F. M‘Coy, 1855. ‘ Brit. Paleoz. Foss.,” p. 639. 
- jonesii— L. Agassiz, 1859. “MSS. Enniskillen Coll.” 
9p Morris & Roberts, 1862. ‘“‘Quart. Journ. Geol. Soc.,” Vol. XVIII., p. 101. 
% 3 Enniskillen, 1869. ‘Catal. Types Foss. Fishes,” p. 7. 
Peecilodus jonesu, Agass., MSS. 
Armstrong, Young | 1. 
and Robertson, 
J.J. Bigsby, 
76 
1878. 
. “Catal. West. Scot. Foss.,” p. 62. 
“Thesaurus Devon.-Carb.,” p. 363. 
Two, probably three teeth were attached to each ramus of the jaw. Posterior 
tooth thick and strong, obliquely elliptico-trapezoidal in outline; average breadth 
‘7 inch, length ‘35 inch. Coronal surface tumid, convex somewhat flattened - 
towards the antero-lateral margin, moderately convoluted anteriorly ; one deep 
oblique concavity, about one-third the breadth from the anterior margin, divides 
the surface into two large oblique unequal lobes, extending radially from the con- 
voluted anterior margin ; the first lobe slopes gradually so as to form a prominent 
anterior articular margin; the second or posterior lobe, obtusely rounded, extends 
parallel with the postero-lateral margin ; a number of transverse, strongly marked, 
projecting ridges extend across the surface, roughly parallel with the posterior 
margin, decreasing in size forwards, they are separated by deep hollows. The 
surface is coated with enamel, finely and evenly punctate where unworn, where 
the surface has been worn, sections of the punctures are exposed. Posterior margin 
oroad, sinuous with a bold convexity conforming to the posterior lobe of the crown ; 
antero-lateral margin straight; postero-lateral margin convex, forming with the 
anterior one a more or less acute angle, and converging backwards to the com- 
paratively narrow anterior margin which is convoluted inwards. Basal portion 
conforms generally to the surface. 
The anterior or median tooth, named by Prof. Agassiz Pacilodus transversus, 
was attached to the one described along its antero-lateral margin. Its form is 
triangular, length, *45 inch; breadth, ‘3 inch across the posterior extremity, 
