94 BRITISH FOSSIL VERTEBRATA. 
HELODUWS (continued)— 
mammillaris, L. Agassiz, Poiss. Foss., vol. iii (1843), p. 173 
(name only); J. Morris, Cat. Brit. Foss., 1854, p. 328; F. 
M ‘Coy, Brit. Palaoz. Foss. (1855), p. 631, pl. iil, f. 16. 
Lophodus mammillaris, J. W. Davis, Trans. Roy. Dublin Soc. 
[2] vol. i (1883), p. 406, pl. li, f. 20. 
Loc. L. Carb. Limest.; Armagh. [Tooth; Woodwardian Mus.} 
mitratus, L. Agassiz, Poiss. Foss., vol. iii (1843), p. 173 (name 
only). [? A. szmplex.| 
Loc. Coal-Meas.; Carluke. [Tooth.] 
obliquus: Chomatodus obliguus, F. M‘Coy, Ann. Mag. Nat. 
Hist. [2] vol. ii, 1848, p. 124, and Brit. Paleeoz. Foss. (1855), 
p. 618, pl. ili K, f. 3 (Chomatodus (Helodus) obliguus) ; J- 
Morris, Cat. Brit. Foss., 1854, p. 321. 
Loc. L. Carb. Limest.; Armagh. [Tooth; Woodwardian Mus. } 
planus (Agassiz), M‘Coy. v. Psephodus magnus. 
pusillus (M‘Coy), A. S. Woodward, Cat. Foss. Fishes B. M., pt. i, 
1889, p. 227. 
Polyrhizodus pusillus, F. M‘Coy, Ann. Mag. Nat. Hist. [2] 
vol. ii, 1848, p. 126, and Brit. Palaeoz. Foss. (1855), p. 642, 
pl. iii K, f& 2; J. Morris, Cat. Brit. Foss., 1854, p. 340. 
Loc. L. Carb. Limest.; Armagh. [Tooth; Woodwardian Mus. ] 
? reticulatus: Lophodus reticulatus, J. W. Davis, Trans. Roy. 
Dublin Soc. [2] vol. i (1883), p. 407, pl. li, f. 22, and Quart. 
Journ. Geol. Soc., vol. xl, 1884, p. 626, pl. xxvii, f. 2. 
Loc. Yoredale Rocks; Wensleydale. [Tooth ; York Mus.]} 
richmondiensis, J. W. Davis, Trans. Roy. Dublin Soc. [2] 
vol. i (1883), p. 456, pl. lix, f. 8. 
Loc. U. Carb. Limest.; Richmond, Yorkshire. [Tooth; Brit. 
Mus. ] 
rudis, M‘Coy. v. Psephodus magnus. 
simplex, L. Agassiz, Poiss. Foss., vol. iii (1838), p. 104, pl. xix, 
f. 8-10; J. Morris, Cat. Brit. Foss., 1854, p. 328; J. W- 
Salter, Foss. S. Welsh Coalfield (Mem. Geol. Surv., 1861 
--iJron- Ores.Gt.. Brit., pt. ili); ps. 225, pl. pyedaag 5 oe 
Hancock and T. Atthey, Ann. Mag. Nat. Hist. [4] vol. ix, 
1872, p. 261; J. Ward, [Proc.] N. Staffs. Nat. Field Club, 
1875, p. 220, and Trans. N. Staffs. Inst. Mining Engin., 
vol. x, 1889, pl. i, f. 13; W. J. Barkas, Monthly Rev. 
Dental Surgery, vol. iii, 1875, p. 1o1, f. xlv—xlviii ; R. H. 
Traquair, Geol. Mag. [3] vol. v, 1888, p. 84; A. S. Wood- 
ward, Cat. Foss. Fishes B. M., pt. 1, 1889, p. 172. 
Loc. Coal-Meas.; Staffordshire, Shropshire, Yorkshire, North- 
umberland, South Wales, and Lanarkshire. [Tooth ; Brit. 
Mus. ] =. 
subteres, Agassiz. v. Orodus ramosus. 
