PALJEONISCID^:. 
477 
Trunk elongated. Mandibular suspensorium very oblique ; man¬ 
dible slender; teeth small, conical, and acutely pointed, of different 
sizes, the smaller ones being more externally placed, but without 
specially prominent laniaries. Fins relatively small, with minute 
fulcra, and the rays distaily bifurcating, more or less coated with 
ganoine ; pectoral rays all articulated ; the dorsal opposed to the 
space between the pelvic and anal fins. Scales partially sculptured 
with irregular transverse furrows and dots, and the hinder free 
margin usually serrated. 
The generic definition here adopted is more restricted than that 
of Blainville and Agassiz \ being in accordance with the most recent 
researches of Traquair 2 . 
Palaeonlscus freieslebeni, Blainville. 
1708. Ichthyolithus eislebensis, J. J. Scheuchzer, Piscium Querelas et 
Vindiciae, pi. ii. fig. 1, pi. iv. fig. 2. 
1708. Figures by C. A. Lange, Historia Lapidum figuratorum Ilelvetiae, 
&c., pi. vi. fig. 3, pi. vii. fig. 4. 
1709. Figures by G. F. Mvlius, Memorabilia Saxoniae subterraneae, 
pt. i. figs, ii., iii., v. 
1710. Figures by M. D. S. Buttner, Rudera diluvii testes, pi. xviii. 
figs. 3, 4. 
1719. Figures by P. Wolfart, Historia naturalis Hassiae inferioris, 
pt. i. pi. xii. fig. 1, pi. xiv. figs. 2-4, pis. xvi., xvii., xx. 
1730. Figure by Leibknecht, Hassiae subterraneae specimen, pi. v. 
1768. Figures by Knorr & Walch, Naturgeschichte Verstein. pi. xvii. 
figs. 1, 2, pi. xviii. fig. 2, pi. xix. figs. 1, 2, pi. xx. figs. 2, 3. 
1818. Palceoniscum freieslebenense, II. D. de Blainville, Nouv. Diet. 
d’Hist. Nat. vol. xxvii. p. 320. 
1818. Palceothrissum macrocephalum, H. D. de Blainville, ibid. p. 320. 
1818. Clupea lametherii , H. D. de Blainville, ibid. p. 321. 
1824. Acipenser bituminosus, E. F. Germar, Leonhard's Mineral. 
Taschenbuch, p. 67. 
1829. Palceothrissum blennioicles , F. Holl, Petrefaktenkunde, p. 131. 
1829. Palceothrissum magnum , A. Sedgwick, Trans. Geol. Soc. [2] 
vol. iii. p. 117, pi. viii. figs. 1, 2. 
1829. Palceothrissum macrocephalum , A. Sedgwick, ibid. p. 117, pi. ix. 
fig. 2. 
1829. Palceothrissum elegans , A. Sedgwick, ibid. p. 117, pi. ix. fig. 1. 
1833. Palceoniscus freiesleberii , L. Agassiz, Poiss. Foss. vol. ii. pt. i. 
pp. 5, 66, pis. xi., xii. A 
1833. Palceoniscus elegans , L. Agassiz, ibid. pp. 5, 95, pi. x. b. figs. 4, 5. 
1 Poiss. Foss. vol. ii. pt. i. (1833), p. 41. 
2 Quart. Journ. Geol. Soc. vol. xxxiii. (1877), p. 557. 
