166 flscEs. 



PoBcilodm parallelus, v. Ueltodus sublsevis. 

 P. subkevis, v. Deltodus sublsevis. 



Polyrhizodus magnus, F. McCoy, A. M. N. H. scr. 2, ii (184<S), 

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

 Foss. (18.5-5), 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; Barwell. [Scales. 

 Counterpart of the Type.] 



Pristicladodus dentatus, v. Dicrenodus dentatus. 



P. goughi, v. Dicrenodus goughi. 



Psammodus canaliculatus, v. P. rugosus. 



Psammodus rugosus, Agassiz. P. canaliculatus, F. McCoy, 

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

 (1854), p. 17, and Brit. Palajoz. Foss. (1855), pi. iii g, f. 12, 

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



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

 Brit. Palaeoz. 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. 18—20, p. 630 {pars). 

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

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

 (1855), pi. iii K, f. 4, 4 a, p. 631. Garbuniferov,s Limestone; 

 Armagh. [Teeth.] 



Rhizodus gracilis, v. R. hibberti. 



Rhizodus hibberti (Agassiz and Hibbert). Rhizodus gracilis, 

 F. McCoy, Brit. Pateoz. Foss. (1855), pi. iii G, f. 17, p. 611. 

 Lower Carboniferous ; Oihnerton. [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.] 



Sphcerodus neocondensis, v. Lepidotus raaximus. 



