CATALOG U E 
OF 
FOSSIL FISHES. 
PART IV. 
Order II. ACTINOPTERYGII ( continued ). 
Suborder IV. ISOSPONDYLI ( continued ) 
Family LEPTOLEPID/E {continued). 
Genus LYCOPTERA, J. Miiller. 
[Middendorff’s Sibirische Reise, vol. i. pt. i. 1848, p. 262. j 
Head large ; maxilla arched, with a slightly convex dentigerous 
border ; mandible prominent, the dentary gradually deepening from 
the symphysis backwards without any marked thickening ; teeth 
mmute and closely arranged. Opercular and branchiostegal appa- 
ratus apparently as in Leptolepis. Vertebral contra iu form of 
delieato constricted cylinders. Pectoral tins much larger than the 
pelvic pair ; dorsal fin small and short-based, opposite to the anal 
fin, which is not longer than deep ; caudal fin forkod. Scalos com- 
pletely covering the trunk, none enlarged or thickenod. 
1 Recent researches seem to necessitate a modification of the definition of the 
Isospondyli given in Part III., p. 440, by the omission of the statements 
“ symplectic bone present ” and “ preeoracoid arch present.” The suborder is 
thus mado to include the so called Seyphophori and Haplomi of Cope. Con- 
cerning the former (Mormyridm and Gymnarchidse) see Gf. A. Bouleno-er, Proc 
Zool. Soc. 1898, pp. 775-821. 
t’AKT XV. 
1 
