518 Davis—On the Fossil Fishes of the Chalk of Mount Lebanon. 
the exposed part is 0°05 inch, and the number in a row along the lateral line 
must be large; the series is not sufficiently well preserved to ascertain the exact 
number. 
A second specimen exhibits the anterior portion of the head. The orbit in 
this is somewhat higher than in the one already described. Its anterior margin 
is 0°8 inch from the tip of the snout. The latter forms a somewhat acute angle 
with the upper jaw. The maxilla is 0:7 inch in length, expanded posteriorly 
for attachment. It is furnished with numerous small-pointed teeth. The pre- 
maxillary portion of the jaw must have been small, but is not shown on this 
specimen. The lower jaw was strong, only the posterior part is preserved ; its 
dentition is the same as that of the upper jaw. The branchiostegal rays, of 
which five are exposed, are curved backwards, 0°5 inch in length and moderately 
thick. The pectoral fin is lateral, and attached to the scapular arch opposite 
to the pointed posterior extremity of the operculum. Its rays are small and 
moderate in number. 
This species agrees with the characters of the genus Hoplopteryx, as defined 
by Agassiz (‘‘ Rech. sur les Poiss. foss.,” vol. iv., p. 131), in having the spinous 
and soft rays of both dorsal and anal fins combined, and generally in the form 
and character of the paired fins. It differs from Hoplopteryx antiguus, Agassiz 
(op. cit., pl. xvu., fig. 6-8), in possessing fourteen spinous and eight articulated 
rays in the dorsal fin, and seven spinous and ten articulated rays in the anal 
fin, as against six spinous and eleven articulated rays in the dorsal, and four 
spinous and eight articulated rays in the anal fin of the species described by 
Agassiz. 
This species may be similarly and readily distinguished from Hoplopteryx 
oblongus, Davis. It is also separated from it by the smaller size of the 
scales. 
Formation and Locality.—Soft chalk : Sahel Alma. 
Ex coll_—Lewis Collection, Natural History Museum, South Kensington. 
Genus. Homonotus. Acassiz. Indet. 
Body small, elongate, oval; head more or less triangular, flat on superior 
surface; mouth median size; teeth small; orbit large, the median line towards 
the superior surface; opercular bones and scales with slightly serrated margins ; 
dorsal fin large and long; anal opposite or behind the dorsal, both with anterior 
spinous rays; pectoral and ventral fins small; spinal column small and slender. 
This genus appears to occupy a position intermediate between Beryx and 
Pycnosterinx. The type of the genus is Homonotus dorsalis, Dixon (‘‘ Geology 
and Fossils of Sussex,” p. 372). Professor Agassiz regarded it as a member 
