428 On the Fossil Fishes of the Carboniferous Limestone Series of Great Britain. 
tooth was the terminal posterior one (here described as the tooth of the upper 
jaw). The wider subquadrilateral palate is taken as the anterior tooth from 
the same jaw. Poecilodus parallelus Ag. is described as a separate species, but 
Prof. M‘Coy remarks that “from the character of its ridging, and from the 
parts on the inner and outer sides of it, and the general agreement of the 
margins, &c., I have little doubt that this will ultimately prove to be the middle 
tooth of the P. sublevis” (Deltodus sublevis). Since the above was written 
specimens have been discovered with the teeth of P. sublevis and P. parallelus 
cemented together in juxtaposition, and these prove the correctness of the 
conviction of Prof. M‘Coy. 
In 1858 whilst Prof. Agassiz was visiting this country he spent some time 
in re-examination of the limestone palates in the Enniskillen Collection, tabu- 
lating the result of his labours with a view to the publication of a memoir 
on the subject at an early date. His death, unfortunately intervened before 
the memoir was prepared. It was during this visit that the two genera Cochliodus 
and Peecilodus were thoroughly revised and the great accumulation of specimens 
led Prof. Agassiz to remove some of the species and form new genera for their 
reception. Amongst the new genera were Psephodus, Streblodus, Deltoptychus, 
Xystrodus, and Deltodus. Since ‘the institution of these genera, many new 
species have been added to them from the Limestones of Illinois and other 
American localities by Messrs. Newberry and Worthen and others. 
Deltodus sublevis, Agass. MSS. 
(Pl. LII., figs 7-9.) 
Peecilodus sublevis, L. Agassiz, 1838. “ Rech. surles Poiss. Foss.,” Vol. III.,p. 174, indet. 
os parallelus, i 1838. pl Poa SSRIS 99 py ojos Wyss 4 
¥ sublevis, J. E. Portlock, 1843. “ Geol. of Londonderry, &c.,” p. 461. 
5 parallelus, ss 1843. 5 + 1d 440), 
rs subleevis, C. G. Giebel, 1848. ‘“ Fauna der Vorwelt.,” Vol. L., pt. iii, p. 337. 
a parallelus, 3 1848. eels ae Vol. I., pt. iii, p. 337, 
3 sublevis, H. G. Bronn, 1848. “ Nomencl. paleont.,” p. 1022. 
parallelus, A 1848. 5 op p. 1022. 
* sublevis, Bs 1849. ‘‘ Enumerator paleont.,” p. 647, 
3 paralellus, 1849. - % p. 647, 
55 sublevis, J. Morris, 1854. “Cat. Brit. Foss.,” p. 340. 
F parallelus, ms 1854. ress 5 p- 340. 
sublevis, F. J. Pictec 1854. “Traité de Paléont.,” Vol. IT, p. 270. 
_ parallelus, 5 1854. rr PP Vol. IL, p. 270. 
+ subleevis, F. M‘Coy, 1855. ‘“ Brit. Paleoz. Foss.,” p. 640, pl. 3 I, figs. 7, 8, 9. 
5 parallelus, “5 1855. - 3 »  p- 640, pl. 3 I, fig. 6. 
Deltodus sublevis, L. Agassiz, 1859. MS. Enniskillen Coll. 
5 - Morris and Roberts, 1862. “Quart. Journ. Geol. Soc.,” Vol. XVIIL, p. 100. 
ap 3 Enniskillen, 1869. “Catal. Types Foss. Fishes,” p. 4. 
Ps - J.J. Bigsby, 1878. ‘Thesaurus Devonico Carb.,” p. 353. 
