Davis—On the Fossil Fishes of the Chalk of Mount Lebanon. 521 
with Hoplopteryx syriacus of Pictet and Humbert (‘‘ Nouv. Rech. sur les Poiss. 
foss. du Mont Liban.,” p. 28, pl. 1.), this specimen has a more elongated form ; the 
vertebral column is comparatively slender; the head is smaller and more attenu- 
ated anteriorly ; the dorsal and anal fins are opposite, and the scales are serrated 
on the margin only to a small extent. Some of these characters are comprised 
in the genus named, but not described by Professor L. Agassiz, Homonotus. 
Mr. F. Dixon (‘‘ Geology and Fossils of Sussex,” 1850, p. 872, pl. xxxv., fig. 2) 
has very briefly and inadequately referred to the specimen named by Agassiz. 
He says: ‘‘ The vertebre are more slender, the head smaller, and it has a longer 
and stronger dorsal fin; the scales are very delicate and rarely seen perfect.” 
A good illustration of the specimen is given, and it appears to possess characters 
very nearly approaching to the one now described. The body is thicker, but 
the arrangement of the fins and the form of the head is similar. The pectoral 
and ventral fins are not present, and the caudal is also absent, so that complete 
characters cannot be stated; nevertheless, those that are exhibited more closely 
approach those of the specimen now described than do those of Beryx or 
Pycnosterinx, and I therefore venture to include this latter in the genus 
Homonotus. 
Formation and Locality.—Upper Cretaceous: Sahel Alma, Mount Lebanon. 
Ex coll.—R. Damon, Esq., Weymouth. 
Acanthopterygii trichiuriformes, GUNTHER. 
Body elongate, compressed or band-like; cleft of the mouth wide, with several 
strong teeth in the jaws or on the palate. The spinous and soft portions of 
the dorsal fin and the anal are of nearly equal extent, long, many-rayed, 
sometimes terminating in finlets; caudal fin forked if present. Giinther. 
Family. TRICHIURIDZ. 
Genus. Enchodus. AGASsiIz. 
Enchodus. Acaassiz, L., 1833-48. ‘Rech. sur les Poiss. foss.,” vol. v., p. 64. 
Isodus. Heckel, J. J., 1843. ‘‘Abbildungen und Beschreibungen der Fische 
Syriens,” p. 241. 
This genus was instituted by Professor Agassiz, and embraced two species, 
viz. Enchodus halocyon, from the chalk of Lewes, and E. faujasii, from the 
chalk of Maéstricht. Only fragments of the head and jaws had been found; 
they were placed in the family Scomberid, Cuvier, from the close relationship 
