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 x 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. 2 Since the appearance of that report we have described 3 an 

 interesting new species, Hymenocephalus 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 no^y 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. 



- Proc. U. S. Nat. Mus., vol. 51, 1916, pp. 137, 141, 186. 

 3 Idem, vol. 54, 1917, p. 173. 



