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534 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 
wceps and longipes, ave marked by two types of striae: the typical 
striation is fine and irregular, and in addition to this there occur 
coarser black cross lines. The black ring about the anus, surround- 
ing also the posterior lens-shaped organ, is continued forward to and 
about the smaller anterior organ. 
The cheeks and the surface of the preopercular region are bril- 
hantly silvery; the opercle is dark, but with metallic luster: the 
ventral half of the suborbital region and the space between the eyes 
show a blackish color through the delicate superficial membranes. 
The snout, between and before the nostrils, is translucent; the 
mandible is mostly dark, but whitish along the lower lip; the end 
of the maxillary is also whitish. The extreme whitish margin of the 
buccal cavity lies just behind a dark area; the roof of this cavity is 
silvery, but the tongue is whitish, as is also the region before it, 
with the exception of a median black triangle, pointed forward; the 
branchial cavity is dark brown on its roof, and whitish on its lower 
sides, but margined by a blackish band with an extreme whitish 
edge on the opercular and branchiostegal membranes. The parietal 
peritoneum is purplish brown, underlain with silvery. 
The vertical fins are usually clear, with a spot at the base of each 
ray, but the first anal ray and the dorsal spines are sometimes 
blackish; the distal half of the first dorsal fin is sometimes dusky, 
as in the type of torvus. 
The specimens from the Tawi Tawi Archipelago, which are re- 
garded as intergrades between aeger and torvus, agree with the pre- 
ceding description in all characters but those showing intergrada- 
tion toward torvus, as has already been discussed. 
Table of measurements in hundredths of length to anus (typical specimens 
of H. 8. aeger). 
‘Albatross stationweses.: vise. eee oe eee 5621 5621 5621 5621 5589 5589 
otal lengthsin mm oases eee eee 165 1459 | 24 cession d| Sas owes ac ERS ate eee 
Length to*anusjin mms os:2222 22222. 222- 39 36 42 36 37 39 
engthiof heades.. (eer es ew a eee 64 62 64 64 67 62 
Lenethiohorbilress a2 ee. ees eee 22 23.5 22 25 25 25 
Widthiofinterorbital 22-7 Ase ee 21 22 21 21 22 21 
Orbit ito,preoperclece 2.220 2c23e82 oe he 30 30 29 7 30 29 
Widthrotisuiborbitale: 95.554 eco eee. s 9 9 9 7 10 9 
Lengthiofisnout? pws: er il ae ae 18 19 14 Lis 19 18 
Lengthiofupperjaw:. sc =. sos-<tfeenesses 32 34 35 Sl). ae Sacre eee 
Lengtbh:ofbarbel 202.324. ease. 2 11 ee!) 9 14 13.5 9 
Depth ofibod'ye.-es oe. eee oe eee 49 45 48 A ed oer |e op \od0c 
Widthrofibod'y s-44-2 6 eee. a eee 30 22 27 32) Se eae 
Height of second dorsal spine............--|..:...---- SO lok eS se oceae See ee ee Beer son os 
Height of first dorsal base...............-- 21 22 23 B90 0M| fh Aca sea Cee eee 
Interdorsalispace.. 2) sac se esse 2-8 eee 55 61 52 53: ox we cee eal eee 
Heightiolfirstianalirays.osomeee. ccs tee. aloes +e See | ome es | eee eee 20 | :4t04. eo) esses 
Length of first pectoral ray......... eee. 2 OF ys UES Soe = traces 2 | -eeoeee e 
Length of second pectoraliray® 3° - 2 -2ascc|ecee - aes]. eee ee 38 39 |-5:::2..3) |e 
Length of third pectoralitay: (3 s0-55-% -sealoseas ow cet t cone eee 41 AY 4) oaecces| seers 
Lengthiof outer ventraliray een os 2 asc ool mee coe al ae meee nl aersenete an oe 52 58 48 
Length of second ventral ray......--.-....|..-.- Eve SPR oo eile eee, See 31 ese -ns| See 
Softirays. first dorsale te oo cee see eee 8 8 9 EN petesocssac psec - 
Ventraltays:< sec: 5. : 225 cccs nea nee mee es 8 8 8 a A Ae eer 2 2 
Pectoralirays::c-t Ls eae ee eee 13 15 15 13). ie. oe Sees | oes 
Gill-rakers, lower limb, second arch........ 19 18 19 19 18 17 
(aeger, feeble.) 
