102 
ACTINOFTERYGII. 
P. 8633. The type specimen, being the head and part of the 
minal region exposed from the right side, shown 
natural size in PI. VHI. ; Gault, Folkestone. 1 ^ 
anterior ethmoidal end of the cranium is slender 
pointed, while the supraoccipital (s.occ.) rises as us 
into a rounded median crest. The ectethmoid or P 
irontal (pr.f.) ig relatively large and stout, with ^ 
usual flattened facetto for the articulation of the a,| t c j_ 
thickened end of the palatine (j pi.). The prenias ^ 
(pmx.) are deeper than long, and meet in the middle ' 
in front of the ethmoid. Their teeth are very sma > 
must have been slightly larger than thoso of the 111,1 ^ 
which are quite minute. The maxilla (mx.) displnJ 9 ^ 
articulation with the palatine in front, and is overlapp 
behind by the cheek-plates : its oral margin is exeava^ 
just behind its anterior end, but is strongl} ° oU 
further back. Its minute teeth aro fixed just within ^ 
rugoso border. The mandible is remarkably deep) * 
the symphysial end of the dentary (tf.) slopes s ’=> ‘ 
backwards and downwards. Its oral margin ls 
exposed in front, where the slonder, styliform ten t 1 ^ 
considerably larger than any shown in the u PP l 1 
There are remains of large, smooth, suborbital c ^ 
plates (s.o.) ; and the sclerotic of the eye (scl.) 1 - 
ossified. The preoperculum ( p.op .) forms a S 1 ® 8 
angular expansion, rather thin and nearly smoot * 
a slightly thickened anterior border. The operculum^ 
and other plates are fragmentary. Some of the an 
vertebral centra are slightly longer than deep, and t 
the characteristic pittings. Tho bases of some 0 ^ 
pectoral fin-rays (pet.) are very large and broad, 
are also obscure remains of large, thin scales. _ Q y 
Purchased l» y '' 
Ichthyodectes minor (Egerton). ^ 
1850. Hypsodon minor, Sir P. Egerton, in F Dixon, Geol. Suss • 
p. xiv, pi. xxxii* fig. 9. , , g (1 c. 
1877. Ichthyodectes minor, E. T. Newton, Quart. Journ. Geo • 
vol. xxxiii. p. 620, pi. xxii. fig. 14. 
TyP e - Imperfect mandible ; British Museum. . ra te 
A species known only by remains of the mandible, of mocle 
size. Oral border of dentary nearly straight, with a sligb 
vexity towards its anterior end ; its outer face not sharp ) 
