124 
ACTINOPTERYGII. 
and dentary (d.) is distinct. There is a narrow sub- 
orbital ring of cheek-plates, deeply channelled for the 
sensory canal; and below this the cheek is covered with 
scales like those of the trunk. Purchased^ 1885. 
47912-13. More fragmentary specimen displaying same features, 
also a smaller fragment; Burham. 
Presented hy the Hon. Robert Marsliam^ 1877. 
P. 6418 a. Remains of head and trunk with paired fins ; Lewes. 
Presented hy P. E. Coombe, Esq., 1888. 
49083. Remains of head and trunk with paired fins; probably 
from Rurham. Mrs. Smith's Coll. 
P. 7652. Fragment with part of dorsal fin ; Kent. 
Purchased, 1895. 
P. 1946. Imperfect trunk ; Rurham. Egerton Coll. 
49077. Imperfect head, some scales, and part of dorsal fin ; probably 
fiom Rurham. The relatively small premaxillae are 
apparently shown, one bearing minute teeth. 
Mrs. Smith's Coll. 
P. 5699. Retter-preserved head, the right side shown of the 
natural size in PI. X. fig. 3, and noticed in Ann. Mag. 
Xat. Hist. [7j vol. iii. (1899), p. 491; Kent. Roth 
premaxilla (pmoo.) and maxilla (mx.) bear minute teeth : 
and the large supramaxillaries (s.mx.) are well preserved. 
AU the bones of the opercular apparatus are displayed. 
Harford Coll. 
49052. Fragment displaying maxilla, inner aspect, with minute 
blunt teeth; probably from Rurham. Mrs. Smith's Coll. 
39429. Fragment showing length of pelvic fins, figured in Proc. 
Geol. Assoc, vol. x. pi. i. fig. 9 ; Kent. Rowerhank Coll. 
25862. Fragment of squamation ; Sussex. Dixon Coll. 
Ctenothrissa microcephala (Agassiz). 
[Plate X. figs. 5, 6.] 
1835-38. Reryx microcephalus, L. Agassiz, Poiss. Foss., Feuill. p. 55, 
and vol. iv. pp. 4, 119, pi. xiv b. figs. 3-6, pi. xiv c. fig. 10. 
1850. Reryx microcephalus, F. Dixon, Geol. Sussex, p. 372, pi. xxxiv. 
fig. 3. 
1850. Reryx radians, F. Dixon, ibid. p. 371, pi. xxxvi. fig. 4 (errore). 
