﻿174 HETEROSTRACI. 



Several ventral shields of Pteraspidians, not hitherto generically 

 determined, have received the names mentioned below. The 

 majority are probably referable to Pteraspis, and of the first the 

 specimen described by Eoemer in 1858 is preserved in the 

 Collection (36047. Purchased, 1861). 



Scaphaspis dunensis, E. E. Laukester, Fishes Old Eed Sandst. 

 pt. i. (18C8), p. 20, woodc. fig. 10: Pteraspis dunensis, 

 T. H. Huxley, Quart. Journ. Geol. Soc. vol. xvii. (1861), 

 p. 163 : Palceoteuthis dunensis, F. Eoemer, Zeitschr. 

 deutsch. geol. Ges. vol. vi. (1854) p. 650, and Palaeonto- 

 graphica, vol. iv. (1855), p. 72, pi. xiii. : Archceoteuthis 

 dunensis, F. Eoemer, in Bronn's Leth. Geoguost. (1855), 

 p. 520, and Xeues Jahrb. 1858, p. 55 : ? Scaphaspis bon- 

 nensis, C. Schliiter, Sitzungsb. niederrhein. Ges. Bonn, 

 1887, p. 125. [Imperfect shield ; University of Bonn.] — 

 Lower Devonian ; Eifel. [Imperfect shield, wanting 

 external layer.] 



Scaphaspis elongata, A. von Alth, Abhandl. k. k. geol. Eeichs- 

 anst. vol. vii. no. 1 (1874), p. 51, pi. ii. fig. 4. — Upper 

 Silurian (red sandstone) ; Wojskie, Galicia. 



Scaphaspis haueri, A. von Alth, ibid. p. 50, pi. iv. figs. 6, 7. — 

 Upper Silurian and Lower Devonian ; Iwanie, Galicia. 

 [Imperial Geol. Survey, Vienna.] 



Scaphaspis hieri, E. E. Lankester, Fishes Old Eed Sandst. pt. i. 

 (Pal. Soc. 1868), pp. 2, 19, 20, woodc. fig. 9, and Geol. Mag. 

 vol. vii. 1870, p. 398 ; A. von Alth, Abhandl. k. k. geol. 

 Eeichsanst. vol. vii. no. 1 (1874), pp. 48, 75, pi. ii. figs. 3, 

 5, 7, 8 : Pteraspis sp.,E.Kner, Haidinger's iSaturw. Abhandl. 

 vol. i. (1847), p. 160, pi. v. figs. 1, 2 (?4) : Palceoteuthis 

 Tcneri, E. von Eicl^wald, Analecta Zool. u. Palaeont. Euss- 

 lands (1871), p. 5 : Pteraspis kneri, A. Kunth, Zeitschr. 

 deutsch. geol. Ges. vol. xxiv. (1872), p. 7 ; F. Schmidt, 

 Yerhandl. russ.-kais. mineral. Ges. St. Petersburg, [2] 

 vol. viii. (1873), pi. v. figs. 1-8 (doubtfully assigns to this 

 species portions of the dorsal shield of a typical Pteraspis, 

 compared with P. crouchi by E. E. Lankester, Geol. Alag. 

 [2] vol. i. ] 874, p. 288).— Upper Silurian ; Galicia. [Im- 

 perial Museum, Vienna.] 



Scaphaspis nathorsti, E. E. Lankester, Kongl. Svenska Vetensk.- 

 Akad. Handl. vol. xx. no. 9 (1884), p. 5, pi. i. figs. 1-3.— 

 Lower Devonian ; Dickson Bay, Spitsbergen. [Eoyal 

 State Museum, Stockholm.] 



