166 PISCES. 



Pcecilodus parallelus, v. Deltodus subhevis. 



P. sublcevis, v. Deltodus sublsevis. 



Polyrhizodus magnus, F. McCoy, A. M. N. H. ser. 2, n (1848), 

 p. 126, and Contrib. Brit. Pal. (1854), p. 21, and Brit. Palseoz. 

 Foss. (1855), pi. iii K, f. 6 8, p. 641. Carboniferous Limestone; 

 Armagh. [Tooth.] 



P. pusillus, v. Helodus pusillus. 



Prionolepis angustus, P. M. G. Egerton, in F. Dixon, Geol. Sus- 

 sex, (1850), pi. xxxii*, f. 3. Lower Chalk; Bui-well. [Scales. 

 Counterpart of the Type.] 



Pristicladodus dentatus, v. Dicrenodus dentatus. 



P. goughi, v. Dicrenodus goughi. 



Psammodus canaliculatus, v. P. rugosus. 



Ps am modus rugosus, Agassiz. P. canaliculatus, F. McCoy, 

 A. M. N. H. ser. 2, n (1848), p. 122, and Contrib. Brit. Pal. 

 (1854), p. 17, and Brit. Pateoz. Foss. (1855), pi. iii G, f. 12, 

 p. 643. Carboniferous Limestone ; Armagh. [Tooth.] 



Psephodus magnus (Agassiz). Cochliodus magnus, F. McCoy, 

 Brit. Palseoz. Foss. (1855), p. 622. Helodus planus, F. McCoy, 

 ibid. (1855), pi. iii I, f. 12 15, p. 631. Helodus didymus, 

 F. McCoy, ibid. (1855), pi. iii I, f. 1820, p. 630 (pars). 

 Helodus rudis, F. McCoy, A. M. N. H. ser. 2, n (1848), p. 123, 

 and Contrib. Brit. Pal. (1854), p. 18, and Brit. Palseoz. Foss. 

 (1855), pi. 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. Palseoz. Foss. (1855), pi. iii G, f. 17, p. 611. 

 Lower Carboniferous; Gilmerton. [Dentary.] 



Another specimen, L. C. Miall, Q. J. G. S. xxxi (1875), 

 p. 624, woodcut. Lower Carboniferous; Gilmerton, near Edin- 

 burgh. [Skull.] 



Scaphodus heteromorphus A. Smith Woodward, Proc. Geol. 

 Assoc. xi (1889), pi. iii, f. 33, p. 300. Stonesfield Slate. [Lower 

 dentition.] 



Sptuerodus neocomiensis, v. Lepidotus maximus. 



