520 
ACTINOPTERYGII. 
Oxygnathus egertoni (Egerton). 
1858. Cosmolepis egertoni, Sir P. Egerton (ex Agassiz, MS.), Figs. & 
Descrips. Brit. Organic Remains (Mem. Geol. Surv.), dec. ix. no. 1, 
pi. i. 
1890. Oxygnathus egertoni , A. S. Woodward, Ann. Mag. Nat. Hist. 
[6] yol. y. p. 432. 
Type. Eish wanting greater portion of head and upper caudal 
lobe; British Museum. 
The type species of Cosmolepis , attaining a length of about 0 - 45. 
Maximum depth of trunk contained about four times in the total 
length. Head and opercular apparatus occupying nearly one 
quarter of the total length; [large teeth apparently more robust 
than in 0. ornatus ] ; cranial roof tuberculated, maxilla and dentary 
striated. Pelvic fins much smaller than the pectorals, arising mid¬ 
way between these fins and the anal; dorsal and anal fins with 
numerous short rays, resulting in their slight extension posteriorly, 
the dorsal somewhat larger than the anal and terminating opposite 
the origin of the latter. Scales with prominent, sparse, superficial 
ridges of ganoine. 
Form. Sf Log. Lower Lias: Barrow-on-Soar, Leicestershire. 
P. 3508. Type specimen. EnnisTeillen Coll. 
P. 585. More imperfectly preserved fish, exhibiting the upper 
caudal lobe, described and figured by Egerton, loc. cit. p. 2, 
fig. 2. Egerton CoU. 
■% 
P. 5854. Small group of ventral scales. 
Presented by Mrs. Etheridge , 1888. 
The specimens recorded below may pertain to Oxygnathus , Mt 
are not generically determinable:— 
P. 959 x. Two maxillae, 0-024 in length, with striated ornament; 
Stonesfield Slate. Egerton Coll. 
Genus CENTROLEPIS, Egerton. 
[Pigs. & Descrips. Brit. Organic Remains, dec. ix. (Mem. Geol. 
Surv. 1858), no. 5.] 
Trunk fusiform, robust, and somewhat elongated. Mandibular 
suspensorium oblique: dentition consisting of an inner series of 
large conical teeth, well spaced but numerous, and an outer close 
series of smaller teeth similar in form ; head, opercular and bran- 
