PHILIPPINE MACROUROID FISHES—GILBERT AND HUBBS. 519 
mouth, and on the gular and branchiostegal membranes. Lining of 
buccal and branchial cavities, wholly blackish; parietal peritoneum, 
brownish black. Fins dusky, the pectorals and ventrals dark; outer 
ventral ray, light. 
Measurements in hundredths of length to anus (66.5+ mm.).— 
Length of head, 77; length of orbit, 18; postorbital length of head, 
24; least width of interorbital, 18; least width of suborbital, 10; 
distance between orbit and preopercular margin, 24.5; preocular 
length of snout, 36; preoral length of snout, 34; width of snout at 
base, 29; width of snout at end of ethmoid portion of infraorbital 
ridge, 24; length of maxillary, 16.5; length of barbel, 3; depth of 
body below origin of first dorsal, including the spines on the scales, 
35; width of body over pectoral bases, 28; distance from center of 
anus to base of outer ventral ray, 21; distance from base of ventral 
to front of scaly area on isthmus, 16.5; length of first dorsal base, 
10.5; length of interval between dorsals, 12.5; length of outer ven- 
tral ray, 23. 
(spinifer, in reference to the relatively immense spine borne on 
each scale). 
Genus HYMENOCEPHALUS Giglioli. 
This genus, which comprises a number of small and fragile 
species dwelling in the moderate depths of tropical seas, has been 
defined in detail by us in our Report on the Macrouroid Fishes of 
Japan.? Since the appearance of that report we have described * an 
interesting new species, Zymenocephalus tenuis, from the Hawaiian 
Islands. In the present report we are basing a new subgenus on a 
new Philippine species and this recently described Hawaiian form; 
in addition to these, another new subgenus, two other new species, 
and one new subspecies are now added to the list. The inclusion of 
these new types makes necessary certain modifications of the generic 
description: the dorsal spine may be weakly denticulate, and the 
gill-rakers may be short and tubercular, and they may be as few as 
10 on the lower limb of the outer two arches, thus attaining the re- 
duced condition which is characteristic of the other genera in the 
Coryphaenoidinae. Even with these modifications the genus remains 
a compact group, but its position in the subfamily now seems some- 
what less isolated than it did before the discovery of these new facts, 
and its relation to Bathygadus is rendered much less apparent. 
1 About 1 mm. has been added as an estimate of amount broken off from the tip of the 
snout. 
2 Proc. U. S. Nat. Mus., vol. 51, 1916, pp. 137, 141, 186. 
3Idem, vol. 54, 1917, p. 173. 
