432 
ACTINOPTEKYGII. 
Belg. [3] voL i. (1881), p. 119, with plate.—Middle Eocene 
(Bruxelliari); Schaerbeek, near Brussels. [Fragments of 
trunk with median fins; Royal Museum of IN’atural 
History, Brussels.] 
Genus PLATAX, Cuvier. 
[Regne Animal, vol. ii. 1817, p. 334.] 
Trunk much deepened, and head short and deep, with a large 
supraoccipital crest. Eye very large ; cleft of mouth small, the 
gape not extending behind the anterior border of the orbit; 
relatively small maxilla expanded behind; teeth in premaxilla and 
dentary setiform and clustered, those of the outer series largest and 
notched at the apex. Pelvic fins inserted directly below the pec¬ 
torals, somewhat larger than the latter; dorsal fin much elevated 
and extending along nearly the whole of the back, with 3 to 7 short 
anterior spines; anal fin also considerably elevated, with 3 short 
anterior spines ; caudal fin rounded or only slightly forked. Scales 
thin and small, none enlarged, some extending over the bases of 
the median fins. 
Existing species occur in the Indian Ocean and the western part 
of the Pacific Ocean. 
Platax woodward!, Agassiz. 
1833. Figures by S. Woodward, Geol. Norfolk, pi. iii. figs. 31-33. 
1842-44. Platax ivoodwardii, L. Agassiz, Poiss. Foss. vol. iv. p. 250, 
pi. xix. fig. 3. 
1882. Platax tvoodivardii, E. T. Newton, Vert. Forest Bed (Mem. Geol. 
Surv.), p. 122, pi. xix. figs. 1-3. 
1891. Platax woodivardi, E. T. Newton, Vert. Pliocene Deposits, 
Britain (Mem. Geol. Surv.), p. 89. 
Type. Detached bones, thickened by hyperostosis. 
An indeterminable large species known only by detached bones, 
most of which are thickened by hyperostosis. 
Form. ^ Log. Lower Pliocene (Red and Coralline Crags) : Suffolk. 
Upper Pliocene (Norwich Crag, Weybourn Crag, and Forest Bed) : 
Norfolk and Suffolk. 
301-3, 305-6, 308, 312, 317-8, 321, 323, 327. Numerous thickened 
bones of different forms, some polished to show structure; 
Crag, Norfolk and Suffolk. Purchased, 1837. 
23200. Four vertebral centra ; Crag, Norfolk. 
Presented hy S. P. Woodward, Esq. 
