36 Pisces. 
PISCES. 
Ctenodus cristatus , Ag., and murchisoni , Ward (foss.), figured by A. S. 
Woodward, Cat. ii, pi. iv. 
Megapleuron rochei, Gaudry (foss.), figured by Sauvage, Poiss. foss. 
Bass, houill. et perm. Autun et Epinao, pi. v, fig. 1. 
\ 
ARTHRODIRA. 
Cope, E. D. On the Cranial Structure of Macropetalichthys. P. U. S. 
Nat. Mus. xiv, pp. 449-456, pis. xxix & xxx. 
Macropetalichthys, Ow. : Cope, t. c. pp. 449 & 457, discusses the cranial 
structure of M. rapheulolabis , Ow., and sullivantii , Newb., and describes 
the paired fins of M. nitidus , Cope. 
Goccosteus decipiens , Ag. : notes on its structure ; Traquair, P. Phys. 
S »c. Edinb. 1889-90, p. 211, pi. xi : figured by A. S. Woodward, Cat. ii, 
pi. vii. C. disjectus , n. sp., id. t. c. p. 292, pi. viii, figs. 1-4, Upper Old 
Red Sandstone, Irelaud. 
Phlyctcenius anglicus, Traq., redescribed by Traquair, t. c. p. 227, 
pi. xii. 
Holonema , Newberry : on the pectoral limb ; Cope, P. U. S. Nat. Mus. 
xiv, p. 456, pi. xxx, fig. 7 : on the dermal plates ; II. S. Williams, P. Am. 
Ass. xxxix, p. 337. 
Homosteus milleri , Traq. : notes on some dermal plates by A. S. Wood- 
ward, P. Z. S. 1891, p. 198, figs. 
\ Aster oplax, n. g., referred to the Arthrodira , but of uncertain family- 
affiuities. A. scabra, n. sp., A. S. Woodward, Ann. N. H. (6) viii, p. 11, 
pi. iii, Devonian of Spitzbergen. 
OSTRACODERMI. 
This subclass is divided into two orders by A. S. Woodward, Cat. foss. 
Fish, ii, p. 159 : — Heterostraci (Pteraspklce) and Osteostraci ( Cephalaspidai , 
Treniataspidce, Asterolepidce, and Ceraspidce). 
HETEROSTRACI. 
Cyathaspis macculoughii , n. sp., A. S. Woodward, Cat. ii, p. 172, pi. ix, 
fig. 4, Lower Old Red Sandstone, Herefordshire. 
Pteraspis nathorsti , Lank. : note by A. S. Woodward, Ann. N. II. 
(6) viii, p. 2, pi. ii, fig. 1. 
OSTEOSTRACI. 
Cephalaspis murchisoni , Egert., figured by A. S. Woodward, Cat. ii, 
pi. x, figs. 1-4. 
Pterichthys milleri , Ag., pi. v, figs. 2-7, testudinarius, Ag., pi. v, fig. 8, & 
pi. vi, fig. 1, productus , Ag., pi. v, fig. 9, & pi. vi, fig. 2, and oblongus, Ag., 
pi. v, fig. 10, & pi. vi, figs. 3 & 4, figured ; id. ibid. 
