SEMIOXOTID^J. 
137 
P. 3537 a. Somewhat smaller and more elongated fish. 
Enniskillen Coll. 
P. 6178. Imperfect much elongated fish 0-075 in length, in counter¬ 
part. Purchased , 1890. 
Dapedius radiatus (Agassiz). 
1836-44. Tetragonolepis radiatus , L. Agassiz, Poiss. Foss. vol. ii. pt. i. 
p. 201, pi. xxiii. a. fig. 2. 
1854. TEchmodus radiatus, J. Morris, Catal. Brit. Foss. p. 317. 
Type. Imperfect head and trunk ; British Museum. 
A small species or variety differing only from the young of 
D. politus (so-called D. leiosomus ) in the prominence of the pectina¬ 
tions and crenulations on all the flank-scales. Whether or not this 
$ 
character is due to the superficial abrasion of the scales, still remains 
to he determined. 
Form. Loc. Lower Lias : Lyme Regis, Dorsetshire. 
P. 468. Type specimen. Egerton Coll. 
28716. Head and lower portion of the trunk of an equally orna¬ 
mented fish. _ Purchased , 1853. 
35559. A partially distorted specimen 0’115 in length, with crenu- 
lated scales. Purchased , 1855. 
35722. Another feebly ornamented specimen 0-145 in length, 
wanting the greater part of the head and ventral region. 
Purchased , 1859. 
P. 1564. A specimen much resembling the type, but with more 
feebly ornamented scales and exhibiting more of the 
trunk. Egerton Coll. 
P. 3537 b. Small comparatively elongated fish 0-088 in length, with 
ornate scales. Enniskillen Coll. 
Dapedius orbis, Agassiz. 
1836. Dapedius orbis, L. Agassiz, Poiss. Foss. vol. ii. pt. i. p. 218, 
pi. xxv. d. 
1849. Dapidius orbis, W. C. Williamson, Phil. Trans, p. 445. 
Type. Fish, wanting tail. 
A large species attaining a length of about 0-45. Maximum 
depth of trunk nearly equal to its length (exclusive of the caudal 
fin) and about four times as great as the depth of the caudal pedicle. 
Head with opercular apparatus occupying somewhat less than one- 
