PISCES. 1 63 



Helodus pusillus (McCoy). Polyrhizodus pusillus, 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. 2, 2 a, b, 



p. 642. Carboniferous Limestone ; Armagh. [Tooth.] 

 H. rudis, v. Psephodus magnus. 

 Holoptychius giganteus, Agassiz. H. princeps, F. McCoy, A. 



M. N. H. ser. 2, n (1848), p. 310, and Contrib. Brit. Pal. 



(1854), p. 42, and Brit. Palseoz. Foss. (1855), p. 595. Old Red 



Sandstone; Scat Craig. [Scale.] 

 H. hopkinsi, v. Acrolepis hopkinsi. 

 H. princeps, v. Holoptychius giganteus. 

 H. sedgwicki, v. Glyptolepis leptopterus. 

 Homacanthus macrodus, F. McCoy, A. M. N. H. ser. 2, II 



(1848), p. 115, and Contrib. Brit. Pal. (1854), p. 10, and Brit. 



Palseoz. Foss. (1855), pi. iii K, f. 20, 20 a, p. 632. J. W. Davis, 



Trans. Roy. Dublin Soc. ser. 2, I (1883), p. 362 (not figured). 



Carboniferous Limestone ; Armagh. [Spine.] 



H. microdus, F. McCoy, A. M. N. H. ser. 2, n (1848), p. 115, and 

 Contrib. Brit. Pal. (1855), p. 10, and Brit. Palseoz. Foss. (1855), 

 pi. iii K, f. 19, 19 a, p. 633. Carboniferous Limestone; Armagh. 

 [Spine.] This specimen cannot be found. 



Ischyodits brevirostris, v. I. thurmanni. 



Ischyodus thurmanni, Pictet and Campiche. /. brevirostris, 

 Egerton, var. 2, E. T. Newton, Chimaaroid Fishes Brit. Cret. 

 Rocks (Mem. Geol. Survey, 1878), pi. ix, f. 11, p. 31. Lower 

 Chalk; Isleham, near Newmarket. [Right mandibular ramus.] 



Janassa clavata (McCoy). Chomatodus clavatus, F. McCoy, 



Brit. Palseoz. Foss. (1855), pi. iii K, f. 10, 10 a, b, p. 617. 



Carboniferous Limestone ; Armagh. [Tooth.] 



Chomatodus (Petalodus) truncatus, Agassiz, F. McCoy, ibid. 



(1855), pi. iii I, f. 1, 1 a, p. 618. Carboniferous Limestone; 



Armagh. [Tooth.] 

 J. imbricata (McCoy). Climaxodus imbricatus, F. McCoy, A. M. 



N. H. ser. 2, n (1848), p. 129, and Contrib. Brit. Pal. (1854), 



p. 24, and Brit. Pal^oz. Foss. (1855), pi. iii G, f. 5, 5 a, p. 620. 



Carboniferous Limestone ; Derbyshire. [Tooth.] 



112 



