INTRODUCTION. 
XI 
mains of skeletons, which afford important information concerning 
features of real Biological significance and value. 
The preliminary sketch of Agassiz has been followed by numerous 
publications of greater or less extent, and nearly all of these, it is 
- hoped, are noticed in the present Catalogue. Many are brief 
descriptions in geological treatises, but several are of a more special 
kind and worthy of enumeration. 
The detached teeth and spines of Carboniferous Elasmobranchs 
have been described in Britain by E. M‘Coy 1 and J. W. Davis 2 ; in 
Belgium by L. G. de Koninck 3 and M. Lohest 4 ; in Russia by 
H. Romanowsky 5 and H. Trautschold 6 ; and in the Enited States 
by J. S. Newberry 7 and 0. St. John 8 , partly in conjunction with 
A. H. Worthen 9 . Only four types of Carboniferous dentition, 
however, are known with much completeness 10 ; and the only 
skeletons worthy of note are those of Sphenaccuithus (p. 242), 
Cliondrenchelys (p. 15), and Claclodus (p. 26), from the Lower Car¬ 
boniferous of Scotland; “ Clcidodas ” from the Erie Shale of Ohio 
(p. 457) ; and Pleuracanthus u , from the Middle Coal-Measures of 
1 In A. Sedgwick and F. M'Coy, British Palieozoic Bocks and Fossils, 
4to, Cambridge, 1855. 
2 J. W. Davis, “ On the Fossil Fishes of the Carboniferous Limestone Series 
of Great Britain,” Trans. Roy. Dublin Soc. [2] vol. i. (1883), pp. 327-600, 
pis. xlii.-lxv. 
3 L. G. de Koninck, “ Faune du Calcaire Carbonifere de la Belgique,” pt. i. 
(in Ann. Mus. Boy. d’Hist. Nat. Belg. vol. ii. 1878). 
4 M. Lohest, “ Recherches sur les Poissons des Terrains Paleozoiques de 
Belgique,” Ann. Soc. Geol. Belg. vol. xi. (1882), pp. 295-325, pis. iii.-v. 
5 H. Romanowsky, “ Description de quelques Restes de Poissons Fossiles 
trouves dans le Calcaire Carbonifere du Gouvernement de Toula,” Bull. Soc. 
Imp. Nat. Moscou, 1864, pt. ii. pp. 157-170, pis. iii., iv. 
6 H. Trautschold, “Fischreste aus dem Devonischen des Gouvernments 
Tula,” Nouv. Mem. Soc. Imp. Nat. Moscou, vol. xiii. (1874), pp. 261-276, 
pis. xxvi., xxvii. Also “Die Kalkbriiche vonMjatscbkowa,” ibid. pp. 277-299, 
pis. xxviii., xxix., and vol. xiv. (1879), pp. 49-61, pis. vi., vii. 
7 In the Reports of the Geological Survey of Ohio, vol. i. pt. ii. (1873), and 
vol. ii pt. ii. (1875). Also in the Annual Report of the Geological Survey of 
Indiana, 1876-78 (1879), pp. 341-348. 
8 In Hayden’s Final Report of the Geological Survey of Nebraska (1872). 
9 Geological Survey of Illinois, vols. ii. (1866), iv. (1870), vi. (1875), and 
vii. (1883). 
70 Cladodus (p. 25), Archaobatis (p. 108), Psepkodus (p. 178), and Cochliodus 
(p. 208). 
11 C. Brongniart, Etudes sur le Terrain Houiller de Commentry.—Faune 
Iebthyologique, pt. i. (1888). 
