536 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



List of stations. 



From the data presented above it seems probable that this species in- 

 habits water averaging deeper and colder than any other Philippine 

 species of the genus, with the probable exception of H. barbatuhis. 

 The record from near Hongkong is unusual, and possibly erroneous. 



The body is robust anteriorly, its greatest depth, below origin of 

 first dorsal, being contained but 1.25 times in length of head; the 

 para types, especially smaller ones, are more slender, the depth being 

 contained from 1.35 to 1.5 times in head (2.0 times in H. gracilis). 

 The lateral outlines of the head are strongly and evenly curved an- 

 teriorly ; the sides of the head posteriorly are subvertical on the mid- 

 dle third, but are concave above and below. The width of the head 

 is decidedly greater than its postorbital length. The snout projects 

 horizontally forward from the vertical through front of premaxil- 

 laries a distance half as long as the pupil; the snout is a little shorter 

 than the interorbital, its length is contained 1.25 (1.1 to 1.4) times 

 in the orbit, and 3.8 (3.7 to 4.1) times in the head. The orbit is of 

 irregular outline; its oblique length, which is the greatest, is con- 

 tained 1.4 (1.3 to 1.5) times in the postorbital, or 3.0 (2.9 to 3.3) times 

 in the total, length of head. The middle of the length of the head is 

 midway between the hind margins of the pupil and of the orbit 

 (varying to each of these limits in the paratypes). The least width 

 of the interorbital space, contained 3.35 (3.0 to 4.0) times in the head, 

 lies above the front of the pupil, from which place the sides of the 

 interorbital diverge widely posteriorly; the least suborbital width is 

 about equal to the diameter of the pupil. The length of the long and 

 slightly oblique upper jaw is contained 1.9 (1.8 to 1.9) times in the 

 head. The teeth are minute, and occur in narrow bands along the 

 jaws. No" trace of a barbel is developed. The angle of the preoper- 

 cular ridge is sharp, but scarcely produced backward ; the crenulate 

 margin of the preopercle is evenly rounded. In the degree to which 



