546 Davis— On the Fossil Fishes of the Chalk of Mount Lebanon. 
These characters do not clearly associate the genus with any existing fish, 
but present a modification of several. M. Pictet considers that the form of the 
pectoral arch and the feebleness of the skeleton appear to approach the Chon- 
dropterygians, but the ribs and apophyses are better developed than in fishes of 
that class; the nature of the teeth are entirely different to those of the rays. 
The teeth, as already observed, would indicate its relationship to the Pyenodonts, 
but the form of its body and the character of the pectoral arch and spines are 
quite different from those of the fishes of that group. The latter features are 
very similar to those of some of the Siluroids, and bear a close resemblance to the 
form and structure of the pectoral arch of Pimelodus clarias, Geof., of the Nile. 
The spines are similarly striated, and denticulated along the margin, of the same 
form, and are attached in the same way to the pectoral arch. 
I have not seen the specimen figured by M. Pictet, but the description and 
figure appear to indicate a peculiar combination of the characters possessed by 
the Pyecnodonts and the Siluroids, and thus to connect the Ganoids with the 
Teleostean Siluroids. 
Coccodus armatus, PIcTEr. 
(Pl. xxx., fig.,.15) 
C. armatus. Piorer, J. F., 1850. ‘‘ Dese. de quelques poiss. foss. du Mont Liban.,” 
pol, pl 1x., He: 9. 
C. armatus. Prcrer and Humpert, 1866. ‘Nouv. rech. sur les poissons fossiles 
du Mont Liban.,” p. 90. 
This species was named and the dentition described by Prof. Pictet (‘‘ Dese. 
de quelques poissons fossiles du Mont Liban.,” p. 51, pl. 1x., fig. 9). An additional 
specimen is now figured, which has the advantage of exhibiting the head from a 
different point of view, and also connected with it a considerable portion of the 
vertebral column, the base of the dorsal fin and the ventral. 
The head has a total length, from the snout to the posterior point of the 
spinous process emanating from the cranial covering, of 3°6 inches; its height is 
1:8 inch. The whole of the superior portion of the head is covered with strong 
enamelled plates, pitted or grooved on the external surface. The orbit is small, 
situated midway between the snout and the posterior outline of the head, and 
0-3 of an inch below the upper margin of the head. A strong shield-like plate 
extends from a position behind the orbit over the forehead to the snout, and 
extends latero-posteriorly so as to encircle the lower part of the orbit; from the 
centre of the upper surface of this plate, 2:0 inches behind the snout, there 
ascends a large recurved spinous process, of which only the base is preserved. 
The latter is 0°35 inch in diameter, finely striated, and denticulated on the 
