166 PISCES. 
Pecilodus parallelus, v. Deltodus subleevis. 
P. sublevis, v. Deltodus subleevis. 
Polyrhizodus magnus, F. McCoy, A. M. N. H. ser. 2, 11 (1848), 
p. 126, and Contrib. Brit. Pal. (1854), p. 21, and Brit. Paleeoz. 
Foss. (1855), pl. iii K, f. 6—8, p. 641. Carboniferous Lamestone; 
Armagh. [Tooth.] 
P. pusillus, v. Helodus pusillus. 
Prionolepis angustus, P. M. G. Egerton, in F. Dixon, Geol. Sus- 
sex, (1850), pl. xxxu*, f. 3. Lower Chalk; Burwell. [Scales. 
Counterpart of the Type.] 
Pristicladodus dentatus, v. Dicrenodus dentatus. 
P. goughi, v. Dicrenodus goughi. 
Psammodus canaliculatus, v. P. rugosus. 
Psammodus rugosus, Agassiz. LP. canaliculatus, F. McCoy, 
A. M. N. H. ser. 2, 11 (1848), p. 122, and Contrib. Brit. Pal. 
(1854), p. 17, and Brit. Paleeoz. Foss. (1855), pl. 1 G, f. 12, 
p. 643. Carboniferous Limestone; Armagh. [Tooth.] 
Psephodus magnus (Agassiz). Cochliodus magnus, F. McCoy, 
Brit. Paleeoz. Foss. (1855), p. 622. Helodus planus, F. McCoy, 
bid. (1855), pl. ii 1, f 12—15, p. 631. Helodus didymus, 
F, McCoy, ibid. (1855), pl. ii 1, f. 18S—20, p. 630 (pars). 
Helodus rudis, F. McCoy, A. M. N. H. ser. 2, m (1848), p. 123, 
and Contrib. Brit. Pal. (1854), p. 18, and Brit. Palseoz. Foss. 
(1855), pl. iii K, f. 4, 4 a, p. 631. Carboniferous Limestone ; 
Armagh. ['Teeth.] 
Rhizodus gracilis, v. R. hibberti. 
Rhizodus hibberti (Agassiz and Hibbert). Rhizodus gracilis, 
F. McCoy, Brit. Palwoz. Foss. (1855), pl. ii G, f 17, p. 611. 
Lower Carboniferous ; Gilmerton. [Dentary.] 
Another specimen, L. C. Miall, Q. J. G. S. xxx (1875), 
p- 624, woodeut. Lower Carboniferous; Gilmerton, near Hdin- 
burgh. [Skull.] 
Scaphodus heteromorphus, A. Smith Woodward, Proc. Geol. 
Assoc. XI (1889), pl. iii, f. 33, p. 300. Stonesfield Slate. [Lower 
dentition. ] 
Spherodus neoconiensis, v. Lepidotus maximus. 
