48 
actinoptf.rygii. 
certainty. The postfrontal or sphenotic {pt.f.) projects a 
little on each side and cau he seen from above. Remains 
of the cheek-plates (s.o.) on both sides are very delicate, 
and exhibit the characteristic radiating markings. The 
jaws are too imperfect for description, but one of the cha- 
racteristic hinder mandibular teeth is seen. The opercu 
lum, though fragmentary, is shown to have been deeper 
than broad ; while the preoperculum must clearly have 
been very little expanded at its angle. Of the gular plate 
only the hinder end is preserved. Egerton Coll- 
Genus SPANIODON, Pictet. 
[Poiss. Foss. Mt. Liban, 1850, p. 33.] 
Syn. Lewisia, J. W. Davis, Trans. Roy. Dublin Soc. [21 vol. iii. I 887 ’ 
p. 593. 
Trunk elongated and laterally compressed, abdomen trenchant- 
Cheek-plates robust, exhibiting radiating branches from the slime 
canal; jaws toothless, except the anterior end of the mandible, 
which bears one or two pairs of large conical teeth. Branch!®' 
stegal rays at least 15 in number. Vertebral centra strengthen® 
by a few longitudinal ridges ; ribs very delicate and nearly straight- 
Pectoral fins large and pelvic fins smaller, these opposed to the 
hinder end of the dorsal or slightly behind it ; anal fin remote, 
small and not much extended; caudal fin deeply forked. 7,0 
enlarged scale at the base of the paired fins ; no enlarged ridg e 
scales. 
. The ^eleton of this fish is so delicate that it is usually distorted 
in the fossils. It is thus very difficult to distinguish the specie 3 - 
'which seem to differ from each other only in their general propor- 
tions and in the relative length of the vertebral centra. 
Spaniodon blondeli, Pictet. 
[Text-figure 4.] 
1&50. Spaniodon blondelii, F. .1. Pictet, Poiss. Foss. Mt. Liban, P- 3i 
pl. v. figs. 2-4. 
1887. Spaniodm blondelii, J. W. Davis, Trans. Roy. Dublin Soc. [2. 
n 1887 p ' 687, p1 ' xxxiv - %• 3 - , o 
'■ ’ r'- ‘fantodon electus, J. W. Davis, ibid. p. 589, pl. xxxiv. fig- * 
l 'early complete fish ; Edinburgh Museum.] 
2^|/pc. Imperfect fish ; Geneva Museum, 
a T Fl Bpecies ’ atta ining a length of about 0-2. The maxing” 
epth of the trunk equals about two thirds of the length of th 
