﻿PALJBONISCID^!. 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 distally 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 l , being in accordance with the most recent 

 researches of Traquair 2 . 



Palse oniscus freieslebeni, Blainville. 



1708. IchthyoUthus eislebensis, J. J. Scheuchzer, Piscium Querelas et 

 Vindiciae, pi. ii. fig'. 1, pi. iv. fig. 2. 



1708. Figures by C. N. Lauge, Historia Lapidum figuratorum Helvetia?, 

 &c, pi. vi. fig. 3, pi. vii. fig. 4. 



1709. Figures by G. F. Mylius, Memorabilia Saxonige subterranese, 

 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. 

 173^9. Figure by Leibknecht, Hassiae subterranese 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. 

 '* 183/ p^lceoniscum freieslebenense, H. D. de Blainville, Nouv. Diet. 



d'liist. Nat. vol. xxvii. p. 320. 

 1818. Pales othrissum 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. Paleeothrissum blennioides, F. Holl, Petrefaktenkunde, p. 131. 

 1829. Paleeothrissum magnum, A. Sedgwick, Trans. Geol. Soc. [2] 



vol. iii. p. 117, pi. viii. figs. 1, 2. 

 1829. Paleeothrissum macrocephalum, A. Sedgwick, ibid. p. 117, pi. ix. 



fig. 2. 

 1829. Paleeothrissum elegans, A. Sedgwick, ibid. p. 117, pi. ix. fig. 1. 

 1833. Pakeoniscus freieslebeni, L. Agassiz, Poiss. Foss. vol. ii. pt. i. 



pp. 5, 66, pis. xi., xii. 

 1833. Palceoniscus elegans, L. Agassiz, ibid. pp. 5, 9o, pi. x. b. figs. 4, 5* 



1 Poiss. Foss. vol. ii. pt. i. (1833), p. 41. 



2 Quart. Jo urn. Geol. Soc. vol. xxxiii. (1877), p. 557. 



