462 
ACTINOPTEEYGII. 
mandible at least one third its length; superficial rugosity on 
cranial roof and dentary fine and delicate. Teeth moderately stout, 
quite smooth, with apices slightly incurved. 
Form. Loc. Lower Eocene (London Clay) : London Basin. 
P. 4148. Very fragmentary small head with opercular apparatus, 
labelled as intended to be the type specimen; Sheppey. 
Thej aws with teeth are not shown. Enniskillen Coll. 
38919. Fragmentary head and abdominal region, showing scales 
with parts of the anterior dorsal and pelvic fins; Sheppey. 
Bowerhank Coll. 
P. 356 a. Two more imperfect specimens displaying anterior squam- 
ation, some of the scales extending over the operculum ; 
Sheppey. Purchased, 1881. 
P. 9455. Fine comparatively large head with opercular apparatus, 
displaying teeth ; Sheppey. Purchased. 
P. 9456. Two smaller imperfect heads, showing teeth; Sheppey. 
Purchased. 
P. 7524. Imperfect head with opercular apparatus; Sheppey. 
Caleb Evans Coll. 
40204. Fragmentary head ; Sheppey. Purchased, 1 867. 
P. 9457. Smaller fragmentary head; Sheppey. Purchased. 
43117. Imperfect small head, displaying opercular bones ; Primrose 
Hill, London. Wether ell Coll. 
P. 1742. Five fragmentary specimens; Sheppey. Egerton Coll. 
P. 4147. Three fragmentary specimens ; Sheppey. 
EnniskitXlen Coll. 
24614. Hinder half of cranium ; Sheppey. Purchased, 1850. 
Scombrinus macropomus (Agassiz). 
1835. Cyhium macropomum, L. Agassiz, Poiss. Foss., Feuill. p. 42 
(name only). 
1839-44. Cyhium macropomum, L. Agassiz, Poiss. Foss. vol. v. pt. i. 
p. 62, pi. xxvi. figs. 1-3. 
1854. Cyhium macropomum, R. Owen, Catal. Foss. Kept. & Pisces 
Mus. Roy. Coll. Surg. p. 161. 
Type. Imperfect head ; Museum of Natural History, Paris. 
A species known only by the head with opercular apparatus. 
