SEMIOjST OTIDiE. 
151 
Dapedius magnevillei, Agassiz. 
1833-36. Tetragonolepis magneville , L. Agassiz, Poiss. Foss. vol. ii. 
pt. i. pp. 7, 214, pi. xxiv. 
1852. Dapedius magneville , F. A. Quenstedt, Handb. Petrefakt. p. 203. 
Type. Nearly complete fish ; Caen Museum. 
A species of moderate size. Maximum depth of trunk equal to 
its length (exclusive of the caudal fin) and about six times as great 
as the depth of the caudal pedicle. Head with opercular apparatus 
occupying much less than one-quarter of the total length of the 
fish; the external bones ornamented with distinct tuberculations. 
All the scales, except those towards the end of the tail, ornamented 
with sparsely arranged tubercles. 
Form. <$f Log. Upper Lias : Normandy. 
P. 7431. Very imperfectly preserved fish, about 0-33 in length ; said 
to have been obtained from Caen, but probably from 
Curcy. Tesson Coll. 
As already pointed out (A. S. Woodward, Ann. Mag. Nat. Hist. 
[6] vol. i. 1888, p. 356), vertically crushed specimens of Dapedius 
form the basis of the so-called genus Amblyurus (L. Agassiz, 
Poiss. Foss. vol. ii. pt. i. 1836, p. 220). A single species, A. macro- 
stomus (Agassiz, ibid. p. 220, pi. xxv. e), is founded upon specimens 
from the Lower Lias of Lyme Eegis, now in the Oxford Museum : 
and the following are similar fossils which can only be generically 
determined:— 
35564, 35788. Two crushed and distorted fishes showing ventral 
aspect, the first small, the second large and displaying 
bifid teeth; Lower Lias, Lyme Eegis. Purchased, 1860. 
36338. Another example, ventral aspect, wanting tail but showing 
bifid teeth ; Lyme Eegis. Purchased , 1862. 
P. 1562. Similar specimen, showing paired fins and uniserial fulcra ; 
Lyme Eegis. Egerton Coll. 
P. 3574. Two more fragmentary specimens, ventral aspect, showing 
the caudal fin ; Lyme Eegis. Enniskillen Coll. 
P. 2024. More imperfect smaller example, labelled by Agassiz ; 
Lower Lias, Street, Somersetshire. Egerton CoTl. 
The following fragmentary specimens of Dapedius , though also 
specifically indeterminable, are of interest as illustrating anatomical 
characters or showing the distribution of the genus :— 
