EEPIDOSIRENIDiE. 
267 
P. 5012. Dental plate in matrix. 
Presented by John Edward Lee, Esq., 1885. 
(ii.) Lower dental plates. 
P. 44381). Plaster casts of four specimens, figured by Miall, op. at. 
pi. ii. figs. 1, 6, 8, pi. iii. fig. 1 ; originals in the Higgins 
Collection. Enniskillen Coll. 
P. 4438 c. Plaster casts of seventeen specimens : originals in the 
Higgins Collection. Enniskillen Coll. 
23153 a, 24840. Two specimens, the first doubtfully of the lower 
jaw. Purchased, 1849-50. 
28280 a, 28495 a, 28541, 28858. Five specimens. 
Purchasedl, 1853-54. 
34984-5. Two specimens, one much abraded. Purchased, 1860. 
35005, 35008, 36387 a. Five specimens. Purchased , 1860, 1862. 
41287 a. Two specimens. Purchased, 1869. 
42721 a. Three dental plates. 
Presented by H. N. Moseley , Esq., 1871. 
P. 344. Dental plate in matrix, with spine of Nemacanthus. 
Purchased, 1881. 
P. 761. Sixteen dental plates and fragments, mostly mandibular. 
Egerton Coll . 
P. 3394. Eight specimens. Enniskillen Coll. 
Ceratodus parvus 5 Agassiz. 
1838. Ceratodus parvus, L. Agassiz, Poiss. Foss. vol. iii. p. 132, pi. xx. 
fig. 1. 
(P) 1838. Ceratodus obtusus, L. Agassiz, ibid. p. 134, pi. xix. fig. 20. 
[Dental plate; British Museum.] 
1878. Ceratodus parvus, L. C. Miall, Monogr. Siren. & Crossopt. 
Ganoids (Mon. Palasontogr. Soc.), p. 29, pi. v. figs. 3, 4, 6- 
10 . 
(P) 1878. Ceratodus obtusus], L. C. Miall, ibid. p. 30. 
Type. Imperfect dental plate ; Bristol Museum. 
A species evidently closely allied to C. latissimus, but only attain¬ 
ing about half the size of the latter, and with dental plates more 
constant in form. Dental plates triangular, the inner margin being 
sharply angulated opposite, or nearly opposite, the second denticle. 
Denticles usually four in the mandibular dental plates, five in the 
