﻿pteeaspid^:. 173 



inner aspect ; and parts of the ornamented external sur- 

 face are also seen in impression. The pineal pit and the 

 pair of > -shaped depressions on the inner face of the 

 shield immediately behind are conspicuous. 



Presented by Sir Richard Owen, K.C.B., 1884. 



The following species of Cyathaspis have also been described, but 

 there are no examples in the Collection : — 



Cyathasjpis acadica : Pteraspis acadica, G. F. Matthew, Canadian 

 llecord of Science, vol. ii. (1886), p. 251 : Biplaspis 

 acadica, G. E. Matthew, Bull. Nat. Hist. Soc. New Bruns- 

 wick, no. vi. (1887), p. 69, woodc, and Trans. Roy. Soc. 

 Canada, vol. vi. sect. iv. (1888), p. 49, pi. iv. figs. 1-4. — 

 Upper Silurian (Division 2) ; Westfield, New Brunswick. 

 [The type species of Diplaspis.~] 

 Cyathaspis integer, A. Kunth, Zeitschr. deutsch. geol.Ges. vol. xxiv. 

 (1872), p. 7, pi. i. figs. 1-6 ; Jentzsch, ibid. vol. xxxi. 

 (1879), p. 793 ; F. Boemer, Palaeont. Abhandl. vol. ii. 

 (1885), p. 378, pi. xxxiii. fig. 1. — Upper Silurian (erratic 

 block) ; Schoneberg, near Berlin, and Bromberg. [Berlin 

 University Museum.] 

 (?) Cyathaspis schmidti, F. E. Geinitz, Zeitschr. deutsch. geol. Ges. 

 vol. xxxvi. (1884), p. 857, pi. xxx. ; F. Roemer, Palaeont. 

 Abhandl. vol. ii. (1885), p. 379. — Upper Silurian ; 

 Rostock. [Rostock University Museum.] [? Paloeaspis.~\ 

 Cyathaspis sturi, A. von Alth, Abhandl. k.k. geol. Reichsanst. 

 vol. vii. no. 1 (1874), p. 46, pi. v. figs. 1-3. — Upper Silu- 

 rian ; between Doroschoutz and Wasileu, on the Dniester, 

 Galicia. [Dorsal shield ; Imperial Geol. Survey, Vienna.] 

 (?) Cyathaspis symondsi, E. R. Lankester, Rep. Brit. Assoc. 1864, 

 Trans. Sect. p. 58, and Fishes Old Red Sandst. pt. i. (Pal. 

 Soc. 1868), p. 27, pi. vi. fig. 5. — Lower Old Red Sandstone 

 (Cornstones) ; Herefordshire. [Internal cast of dorsal 

 shield ; Museum of Practical Geology.] 



To Cyathaspis may also probably be referred the ventral shields 

 described as follows : — 



Scaphaspis ludensis, E. R. Lankester, Fishes Old Red Sandst. pt. i. 

 (Pal. Soc. 1868), p. 25, pi. ii. fig. 4 : Pteraspis ludensis, J. 

 W. Salter, Ann. Mag. Nat. Hist. [3] vol. iv. (1859), p. 45, 

 woodc. fig. 1. — Lower Ludlow: Church Hill, Leintwardine. 

 Upper Ludlow ; near Ludlow. [Shield : Mus. Pract. 

 Geol.l 



