418 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 
16. CORYPHAENOIDES MICROPS (Smith and Radcliffe). 
Macrourus microps SmMirH and RapcuiFFE, Proc. U. S. Nat. Mus., vol. 48, 
1912, p. 116, pl. 25, fig. 2. 
List of stations. 
| Depth, | Bottom | Number 
pce Locality. in ’ tempera- | of speci- 
aE | fathoms. | ture. mens. 
| ee 
5325 | Off northern IOV eee ets apcaonsecnco see SES Aeon aincose 224 53.2 4 
5470 | Lagonoy Gulf, southeastern Luzon......----------------------- 560) $2 sac nine Type. 
} | 
A series of eight or nine scales separates the origin of the second 
dorsal fin from the lateral-line series. 
Measurements of the large type follow: Length of orbit, 6.0 in head, 
1.7 in snout, 1.15 in interorbital width, 5.2 in head; length of 
snout, 3.7. 
The small specimens, four in number, differ in several respects so 
widely from the type-specimen that one might be led to separate 
them as a distinct form. On the basis of the limited material, and 
especially because the variations are partly paralleled in the growth 
of C. marginatus; we regard the differences between them as being 
due to age variations. The differences in proportion are well indi- 
cated in the table of measurements. Further differences are listed 
below: 
1. The number of parallel rows of spinules on the scales is fewer in the 
smaller specimens (a very similar variation occurs in C. marginatus, the closely 
related Japanese species) .* 
Length toanus | Number of rows 
in mm. of spinules. 
33 3 
53 6to 8 
66 8 toll 
150 (type). 13 to 21 
2. The number and strength of the serrations on the second dorsal spine 
apparently decrease with the age of the fish, as in C. marginatus. They are 
very weak in the type-specimen. 
Length to anus Number of 
in mm, serrations, mm, 
33 16 
ca, 37 12 
53 11 
66 ll 
150 (type). 4 
3. The first dorsal spine is comparatively strong and sharp in the smallest 
specimen, becoming progressively weaker in the larger specimens, being rudi- 
mentary in the large type. This variation is normal. 
1Gilbert and Hubbs, Proc. U. 8. Nat. Mus., vol. 51, 1916, p. 165. 
