176 
ACTINOPTERYGII. 
Genus LEGNONOTUS, Egerton. 
[Ann. Mag. Nat. Hist. [2] vol. iii. 1854, p. 435.] 
Trunk gradually tapering from the occiput backwards or the 
dorsal margin only slightly arcuate. Marginal teeth very long and 
much crowded. Dorsal fin extending almost the whole length of 
the back, and all the rays, except perhaps anteriorly, distally 
bifurcating. Scales apparently covering the whole of the trunk, in 
regular series, those of the middle of the flank much deeper than 
broad. Lateral line forming a conspicuous ridge. 
Legnonotus cothamensis, Egerton. 
1854-55. Legnonotus cotliamensis , Sir P. Egerton, loc. cit. p. 435, and 
Figs, and Descript. Brit. Organic Remains (Mem. Geol. Sure.), 
dec. viii. no. 7, p. 4, pi. vii. figs. 9-12. 
Type. Imperfect trunk ; Bristol Museum. 
The type species, attaining a length of about 0*06. Marginal 
teeth bluntly pointed ; operculum ornamented with large, flattened 
tubercles. Dorsal fin comprising about 30 rays. Scales compara¬ 
tively large, smooth, hut coarsely serrated; principal scales of 
lateral line about two-thirds as broad as deep. 
Form. Sf Loc. Rhsetic (Gotham Marble): Aust Cliff, Gloucester¬ 
shire. 
P. 1092. Three small slabs exhibiting portions of jaws associated 
with a mass of scales, bone-fragments, and ring-vertebrae. 
Egerton Coll. 
Genus MACROSEMXUS, Agassiz. 
[Neues Jahrb. 1834, p. 387.] 
Syn. Disticholepis, V. Thiolliere, Ann. Soc. Sci. Phvs. & Nat. Lyon, 
[2] vol. iii. 1850, p. 136, and Poiss. Foss. Bugey, pt. ii. 1873, 
p. 14. 
Trunk gradually tapering from the occiput backwards; head 
large, snout acute. Teeth much elongated, closely arranged. 
Notochord persistent, without ring-vertebrae; ribs ossified. Fins 
consisting of very robust, bifurcating rays, without fulcra except in 
the caudal; pectoral fins much larger than the pelvic pair; dorsal 
fin arising immediately behind the occiput and extending con¬ 
tinuously to the caudal pedicle; anal fin small; caudal fin rounded. 
Scales thin and more or less pectinated, with peg-and-socket articu¬ 
lation, and apparently wanting towards the dorsal margin; scales 
