PISCES. Sie 
HELODUS (continued)\— 
tenuis, J. W. Davis, Trans. Roy. Dublin Soc. [2] vol. i (1883), 
p- 454, pl. lix, f. 3, 4. [See also Chomatodus cinctus.] 
Loc. L. Carb. Limest.; Armagh. [Teeth; Brit. Mus.] 
triangularis, J. WW. Davis, 77d., p. 456, pl. lix, f. 9. 
Loc. L. Carb. Limest.; Armagh. [Tooth ; Brit. Mus.] 
turgidus, L. Agassiz, Poiss. Foss., vol. iii (1838), p. 106, pl. xv, 
f. 1-12 reas cre on plate) ; J. Morris, Cat. Brit. Foss., 
1854, p. 328; F. M‘Coy, Brit. Palzoz. Foss. (1855), p. 632. 
[See also C AEA: cinctus. | 
Loc. L. Carb. Limest.; Bristol. [Teeth ; Bristol Mus.] 
HEMICLADODUS, Davis. v. Cheirodus. 
unicuspidatus, Davis. v. Cheirodus sp. 
HEMICYCLASPIS, Lankester. v. Cephalaspis. 
murchisoni (Egerton), Lankester. v. Cephalaspis murchisoni. 
HETEROLEPIDOTUS, Egerton. v. Eugnathus. 
grandis, Davis. v. Platysiagum grandis. 
latus, Egerton. v. Eugnathus latus. 
manseli (Egerton), Zittel. wv. Lepidotus manseli. 
minor, Davis. v. Eugnathus latus. 
sauroides, Egerton. v. Eugnathus philpote. 
serrulatus (Agassiz), Egerton. v. Eugnathus serrulatus. 
HISTIONOTUS, P. M. G. Egerton, Ann. Mag. Nat. Hist. [2] 
vol. xiii, 1854, p. 434, and Figs. and Descript. Brit. Organic 
Remains, dec. viii (Mem. Geol. Surv., 1855), no. 5. 
angularis, P. M. G. Egerton, b/d, p. 434, and 7zé7d., pl. v; J. 
Morris, Cat. Brit. Foss., 1854, p. 329; J. C. Mansel-Pleydell, 
Geol. Mag. [3] vol. vi, 1889, p. 241, pl. vii. T. 
Loc. Purbeck Beds ; Swanage. [Imperfect fish; Brit. Mus.] 
HOLASPIS, E. R. Lankester (ex Salter, MS.), Geol. Mag., vol. x, 
1873, p. 242. 
sericea, E. R. Lankester, zi7d., pp. 241, 331, pl. x, and woodcut. 
Loc. L. Old Red Sandst. ; Abergavenny. {Head-shield : Brit. 
Mus. ] T. 
HOLOPHAGUS, P. M. G. ['gerton, Figs. and Descript. Brit. 
| Organic Remains, dec. x (Mem. Geol. Surv., 1861), p. 19; 
i. He Huxley; ibid., dec. xii (1866), p. 26, and 767d, dec. xiii 
(1872), no. 10. [? Undina.] 
gulo, P. M.G. Egerton, Figs. and Descript. Brit. Organic Remains, 
dec. x (Mem. Geol. Surv., 1861), p. 19; T. H. Huxley, zdzd,, 
dec. xii(1866), p.26, pl. vi, and zézd., dec. xiii (1872), no. 10, pl. x. 
Loc. L. Lias; Lyme Regis. [Fish, wanting head ; Mus. Pract. 
| Geol.] T. 
