On the Fossil Fishes of the Carboniferous Limestone Series of Great Brita, 493 
Petalodus hastingsize, Owen. 
(Pl. LIX., figs. 16-21.) 
Petalodus Hastingsie—R. Owen, 1840. ‘“ Odontography,” p. 61, pl. xxii, figs. 3, 4, 5. 
“ 5 L. Agassiz, 1840. “Rech. sur les Poiss. Foss.,” Vol. III., pp. 174 
and 384. 
»,  levissimus, ” 1840. “Rech. sur les Poiss. Foss.,” Vol. IIL, pp. 174 
and 384. 
»  Hastingsii—J. E. Portlock, 1843. ‘Geol. of Londonderry,” &c., p. 468, pl. xiv., 
fig. 10. 
,,  levissimus, P 1843, “Geol. of Londonderry,” &ec., p. 461. 
5 Hastingsie—C. G. Giebel, 1848. “Fauna der Vorwelt,” Vol. I., pt. 3, p. 345. 
5  levissimus, o 1848. » © 5 Vol. L., pt. 3, p. 345. 
a . H. G. Bronn, 1848. ‘‘Nomencl. Paleont.,” p. 949. 
» Hastingsie, 1848, 9 ss p. 949. 
rf .s J. Morris, 1854. “Catal. Brit. Foss.,” p. 337. 
3 levissimus— _,, 1854. BS 5 » do eae 
> % F. J. Pictet, 1854. ‘“ Traité de Paléont.,” Vol. IT., p. 271. 
- Hastingsie, x 1854, y. © 3 WL, 1b, jo BOI 
= Hastingsii —F. M‘Coy, 1855, “ Brit. Paleeoz. Foss.,” p. 635. 
Hastingsie—Morris and Roberts, 1862, “ Quart. Journ. Geol. Soc.” Vol. XVIII, p. 101. 
. levissimus— __,, es 1862, mA - ¢3 op Wolk VOU L fo) ULL, 
= 93 Young & Armstrong, 1871. “Trans. Geol. Soc., Glas.,” Vol. II1., Supplt., p. 74. 
» Hastingsie—W. H. Baily, 1875, ‘Figs. of Char. Br. Fossils,” p. 120, pl. xli, 
fig. 11. 
levissimus—Armstrong, Young, 
and Robertson, 1876. “Catal. of W. Scot. Foss.,” p. 62. 
? 
_ Hastingsie—J. J. Bigsby, 1878. “Thesaurus, Dev.-Carb.,” p. 361. 
$5 leevissimus, 5 1878. y . $5 p. 361 
De Koninck, 1878. “ Fauna du Cale. Carb. de la Belgique.” p. 50, 
‘ i pl. vi., figs. 6, 7, 8. 
Teeth, “crown very thin, scale-like, gently convex along the upper edge, 
turning abruptly downwards at the extremities; base of the crown with a broad 
series of five or six imbricating folds of ganoine, towards which the crown slopes 
without convexity downwards and outwards so that they form the thickest and 
most prominent part of the tooth; they are arched downwards in the middle, but 
abruptly curved upwards, and downwards again at the lateral fourth of the lengths ; 
root abruptly narrowed, flattened, tongue-shaped, one third deeper than the crown 
on the outer side ; surface highly polished, and smooth when perfect, the cutting 
edge alone being marked with a row of punctures ; when worn, however, a fine 
line extends from each of these punctures half-way down the crown, producing a 
striation scarcely visible to the naked eye.” —(J/‘Coy). Average width of the crown 
‘5 of an inch, height of tooth about the same as width of crown, of which the crown 
occupies two-fifths. 
Specimens in the collections of Lord Enniskillen and others bear the nomen 
