532 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



ward H. s. torvus. Both sets are discused under the present heading. 

 The stations at which each were taken are given separately in the fol- 

 lowing lists : 



List of typical specimens. 



Albatross 

 station. 



Locality. 



Number 

 of speci- 

 mens. 



5626 i Between (Jillolo and Kayoa Islands. . 



5625 do ." 



5621 ' Between Gillolo and Makyan Islands. 



1 5593 Vicinity of Sibuko Bay, Borneo 



5590 do 



5589 do 



1 



5 



38 



1 



1 



20 



1 The tag borne by this specimen (No. 4540) corresponds to station 5593, but it is almost certain that an 

 error has crept in here, as the species probably never lives in such shallow water; it is probable that the 

 specimen was obtained at one of the deeper hauls earlier in the same day. 



The distinctive characters of this subspecies are given under the 

 heading of Hymenocej)halus striatissimus. In other respects the de- 

 scription of this form will apply very well to either of the two 

 other subspecies, torvus and striatissimus. The following descrip- 

 tion is based only on the typical series. 



The body is robust anteriorly, becoming rather suddenly con- 

 stricted and then attenuate behind into a whip-like tail; the length 

 of the head is contained 6.32 times in the total length. The head 

 approaches a rectangular outline, when viewed from above, before, 

 or from the side ; it is notably compressed, the greatest width being 

 equal to its postorbital length. The snout is short and blunt, scarcely 

 projecting beyond the mouth, 3.7 (to 4.5) in head. The middle of 

 the length of head lies immediately behind the pupil; the same 

 sometimes holds true in striatissimus. The orbit is obliquely oval; 

 its greatest length, 2.8 in head, 1.3 in postorbital, varying from 1.15 

 to 1.4 (0.9 to 1.1* in typical striatissimus). Interorbital width about 

 equal to length of orbit (decidedly less in striatissimus proper). As 

 in torvus and striatissimus, the suborbital is somewhat narrower than 

 the pupil (about two-thirds length of pupil in the type of torvus). 

 The vertical from the hind margin of the maxillary passes through 

 the eye behind the pupil. The barbel is shorter than the pupil in the 

 type-specimen, but is usually longer; the variation of its length, as 

 compared with the same measurements of the other subspecies. 



