230 
ACTINOPTERTGII. 
Prionolepis angustus, Egerton. 
1850. Prionolepis angustus, Egerton, in Dixon^ Geol. Sussex, p. 368, 
pi. xxxii.^ fig. 3. 
1888. Prionolepis angustus^ A. S. Woodward, Proc. Geol. Assoc, vol. x. 
p. 306. 
Type. Dermal scutes ; British Museum. 
The type species, known only by the scutes of the flank. The 
largest scutes about seven times as deep as broad, and the 
forwardly directed portion above the lateral line comparatively 
short; the hinder margin very regularly, closely, and deeply 
pectinated; the anterior portion either smooth or marked with very 
feeble vertical rugae, except above the lateral line where these rugae 
are conspicuous. 
Form. ^ Log. Turonian and Senonian : S.E. England. 
P. 9253. Type specimen, an imperfect mass of scutes chiefly shown 
from the inner aspect, briefly described and figured by 
Egerton, loc. cit.; Lower Chalk, Burwell, near I^ewmarket. 
Dixon Coll. 
29040. Three fragments of chalk with remains of scutes; Upper 
Chalk, Swaftham, Norfolk. 
Presented hy C. B. Rose, Dsq., 1854. 
46393. Group of scutes; Lower Chalk, Caine, Wiltshire. 
Cunnington Coll. 
35876. Imperfect scute ; Grey Chalk, Dover. Purchased, 
39058. Imperfect scute; Chalk, Kent. Bowerlank Coll. 
49776. Bemains of scutes more ornamented than usual, but 
probably of this species ; Lower Chalk, Dorking. 
Capron Coll. 
Prionolepis catapliractns (Pictet & Humbert). 
1866. Aspidopleurus cataphractus, Pictet & Humbert, Noiiv. Rech. 
Poiss. Foss. Mt. Liban, p. 109, pi. xviii. fig. 1. 
1887. Aspidopleurus cataphractus, J. W. Davis, Trans. Roy. Dublin 
Soc. [2] vol. hi. p. 624, pi. xxxviii. fig. 4. 
1887. Engraulis tenuis, J. W. Davis, ibid. p. 635, pi. xxx. fig. 5 (errore). 
1898. Prionolepis cataphractus, A. S. Woodward, Ann. Mag. Nat. 
Hist. [7] vol. ii. p. 411. 
Type. Imperfect fish ; Geneva Museum. 
The type species of the so-called Aspidopleurus, attaining a 
length of about 0’22. Length of head with opercular apparatus 
