Davis—On the Fossil Fishes of the Chalk of Mount Lebanon. 461 
correct one, though the three species of Dercetis, described from very imperfect 
specimens, have all been found to belong to other genera. As already stated, 
Blainville described two species from the Lebanon fish-beds, Agassiz six, 
Egerton one, and Heckel five; to this number Pictet added twenty. The 
following synopsis of these species may be useful; the locality in each instance 
is appended :— 
BLaINvILLE, . . Clupea brevissima: Hakel. C. beurardi: Sahel Alma. 
Aeassiz, . . . Clupea lata: Sahel Alma. C. minima: 55 
5 Rhinellus furcatus: Sahel Alma. Sphyrzena amici: ,, 
a Pagellus lepidosteus : ‘A Vomer parvulus: ,, 
Ecerton,. . . Cyclobatis oligodactylus: Hakel. 
Hecxet, . . . Clupea macrophthalma: “5 C. gigantea: Hakel. 
. . .  Pyenosterinx discoides: Sahel P. russeggerii: Sahel 
Alma. Alma. 
33 . . + Isodus sulcatus (= Eurypholis): 
Sahel Alma. 
PicteT, . . .  Pagellus libanicus (= P. ovalis): Pycnosterinx dorsalis : 
Sahel Alma. Sahel Alma. 
_ . . » Pyenosterinx heckelii: Sahel Osmeroides megapterus : 
Alma. Sahel Alma. 
7 . . . Mesogaster gracilis: Sahel Spaniodon — blondelli : 
Alma. Sahel Alma. 
3 . . . Eurypholis longidens: Sahel Dercetis tenuis: Sahel 
Alma. Alma. 
. . . . Spaniodon elongatus: Sahel Alma.  D. linguifer: Sahel Alma. 
4% . . . Dercetis triqueter : i Platax minor: Hakel. 
rf . . . Spinax primeevus: 5 Coccodus armatus: Hakel. 
55 . . . SBeryx vexillifer: Hakel. Eurypholis boissier1: ,, 
% . . . Petalopteryx syriacus: Hakel. Clupea laticauda: __,, 
5 . . . Eurypholis sulcidens : 4 
55 . . . Clupea sardinoides : 55 
Included in the above list are four new genera, viz., Petalopteryx, Eurypholis, 
Spaniodon, and Coccodus, which M. Pictet found it necessary to establish for the 
more peculiar and aberrant forms of the fishes he described. 
In 1855, M. O. G. Costa, Professor at the University at Naples (‘‘ Descrizione 
de alcuni Pesci fossile del Libano. Mem. della R. Acad. d. sc. di Napoli,” vol. ii., 
pp. 97-112, with two plates), made an addition of four new species to those 
TRANS. ROY. DUB. S00., N.S. VOL. III, 88S 
