532 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 
ward //. 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. 
| 
ear Depth | Bottom | Number 
eid Se Locality. in tempera- of speci- 
: ; fathoms.| ture. | mens. 
—_ : : e | i} 
oH Mea 
5626 | Between Gillolo and Kayoa Islands...................-------- A605 |> ne sere 1 
5O20N ee eee GO: St Sees otecs eee Moe cehinece see SoA See ae eee Chee 230: | oo encsnee 5 
5621 | Between Gillolo and Makyan Islands.......................--- 2OR Tl ena 38 
15093; |) Vicinity of Sibuko Bay, Bormeols co... seesee> eceee enconetee N38 | masa eae ae 1 
5590 |....- MOE oleae cct an ee ene See ae no Or ees Een ee Re eee 310 44.3 1 
5589 |..... Gokrss-sossace SE oS SRE tte ie LS Base Same ie 260 45.7 26 
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. 
List of specimens varying toward H. s. torvus. 
ba Oy 
S172") Vicinity of: Jolodsland as se. eee: ae eee eos ee een 318° |. neta 33 
Ca Wy ss [aes ODS ee ae eee eee ore bh) eee 1 
DAG eee (0 to teeth NE en ras fe ets ee one Ts gy Se a 263 52.3 1 
ODDO) eens 0 a Eee os i es 2 t Bae mesen ee gee oC Peli Lol ees 258 52.3 1 
nay Wh oes oe (a (a Feeney wee eee Geel eh a a CS Te re RY OD 193 53.3 2 
0563. | Between Jolo:and’ Tawi Law. seen. ee ean oe cee ose eee 224 52.3 7 
Sa (a Paine (6 (a yap ae see SoS ee ee = att ae bea Tne A a bor 236 5250 5 
OHO |e ae GO ete ee Fe Oe ee ee eee eas 243 5233 2 
ODOGEIEee ee 0 Fo ag apes Seeermete Goa 5 Ah Lee Se eens st A rie ee ire a een a 244 52.5 1 
SSTGs ENOCH OLUD awa VIA Wale eres em tee ce ein eee eee ee eee sore een ie Rees 277 53.3 1 
The distinctive characters of this subspecies are given under the 
heading of Hymenocephalus 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 hes immediately behind the pupil; the same 
sometimes holds true in striatissiémus. 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 striatissiémus). 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, 
