526 Davis—On the Fossil Fishes of the Chalk of Mount Lebanon. 
This species differs from Platax minor, Pictet, in the great height of its body 
as compared with the length, in the length of the head in proportion to that of 
the body, and in its obtusely-rounded facial contour as compared with the 
somewhat pointed or aquiline outline of P. minor. M. Pictet and Humbert refer, 
in the description of Platax minor (op. cit., p. 48), to a pointed hook extending 
forwards at the base of the dorsal fin, at right angles to the rays of the fin. 
From a careful examination of several specimens, it appears very probable that 
the bone, mistaken by M. Pictet for an external hook or spine, is really the 
expanded surface of the large interspinous bone which serves to support the long 
anterior ray of the dorsal fin. 
The species of Platax described by Agassiz (“ Poiss. Foss.,” vol. 1v., p. 244, 
et seq.), from Monte Bolca, are sufficiently distinct from this one. PP. papilio, 
Agass., which most nearly resembles P. brevis, is readily distinguished by its 
round body and the short, weak anterior rays of the anal fin. 
Formation and Locality Upper Cretaceous: Hakel. 
Ex coll,—R, Damon, Esq., Weymouth. 
Genus. Vomer. Cuvier. 
Vomer parvulus, AGASS. 
V. parvulus. Acassiz, 1840. ‘Rech. sur les Poiss. Foss.,” vol. y., pp. 4 and 31. 
V. parvulus. Picrer and Humperr, 1866. ‘Nouv. Rech. sur les Poiss. foss, du 
M. Liban.,” p. 50. 
Agassiz simply refers to this species as having been found at Lebanon, but 
gives no description of it. 
MM. Pictet and Humbert refer to the species as having been indicated by 
Agassiz; but not having any knowledge of the specimen, they can give no further 
information. 
Genus. Petalopteryx. PIcTeET. 
Petalopteryx syriacus, Picrer. 
P. syriacus. Prcrrr, F. J., 1850. ‘‘ Description de quelques Poissons fossiles du 
Mont Liban.,” p. 22, pl. ut, fig. 1. 
P. syriacus. Pricrer and Humsert, 1866. ‘Nouv. Rech. sur les Poissons fossiles 
du M. Liban.,” p. 54. 
I have not been able to identify a second specimen of this species amongst the 
many fossil fishes which I have had the pleasure to examine. Pictet does not 
state where the type specimen is located, 
Formation and Locality.—Upper Cretaceous, Hakel, Mount Lebanon, 
