COCHLIODONTIDiE. 
219 
Agassiz l , Heloclus gibberulus, Agassiz 2 , Helodus crassus, Davis 3 , 
and Helodus expansus, Davis 4 . 
P. 2918. Type specimen of Ckomcitodus cinctus, Agassiz, figured tom. 
cit. pi. xv. fig. 13'; Lower Carboniferous Limestone, 
Bristol. Enniskillen Coll. 
20573, 20575, 28537, 34974. Lifteen nearly similar teeth, with a 
more prominent coronal ridge ; Bristol. Purchased. 
32739-40. Two teeth named Helodus iurgidus ; Bristol. 
Presented by S. P. Pratt, Esq., 1857. 
44853. Similar tooth ; Bristol. 
Presented by Benjamin Bright, Esq., 1873. 
P. 1428, P. 1466. Ten similar teeth ; Bristol. Egerton Coll. 
50009. Detached tooth; Bristol. Trevelyan Bequest, 1879. 
P. 2616, P. 2658. Twelve similar teeth ; Bristol. Enniskillen Coll. 
36487, 41189. Four teeth ; Oreton, Shropshire. Purchased, 1868. 
42217. Forty teeth ; Oreton. Baugh Coll. 
P. 1427. Similar tooth; Settle, Yorkshire. Egerton Coll. 
P. 2817. Similar tooth; Upper Carboniferous Limestone, Bichmond, 
Yorkshire. Enniskillen Coll. 
P. 217. Six similar teeth, two with a sharp longitudinal ridge, 
approaching “ Helodus expansus ” ; Oreton. 
Weaver-Jones Coll. 
35483. Abraded tooth; Upper Carboniferous Limestone, Bichmond, 
Yorkshire. Purchased, 1860. 
P. 1474. Tooth of the same kind ; Lower Carboniferous Limestone, 
Hook Point, Wexford, Ireland. Egerton Coll. 
P. 2818. Two teeth; Hook Point. Enniskillen Coll. 
1 Poiss. Poss. vol. iii. p. 106, pi. xv. figs. 1-12. Also F. M‘Coy, op. cit. 
p. 623; L. Gf. de Koninck, op. cit. pt. i. p. 39, pi. iv. figs. 13, 14, pl.vi. fig. 21. 
2 Tom. cit. p. 106, pi. xii. figs. 1, 2; (?) also H. Trautschold, Nouv. Mem. 
Soc. Imp. Nat. Moscou, vol. xiii. (1874), p. 269, pi. xxvi. fig. 9. Lophodus 
gibberulus , J. W. Davis, Trans. Eov. Dublin Soc. [2] vol. i. (1883), p. 405, 
pi. li. fig. 19; (?) also L. Gf. de Koninck, op. cit. pt. i. p. 34, pi. iv. fig. 7. 
3 J. W. Davis, loc. cit. p. 453, pi. lix. figs. 1, 2. Including Chomatodus 
cinctus , Ag., in part. 
4 J W. Davis, loc. cit. p. 457, pi. lix. fig. 10. Including Chomatodus linearis, 
Ag., in part. 
