IWAMOTO & MCCOSKER: DEEP-WATER FISHES OF THE PHILIPPINE EXPEDITION273 
(SiTiith 1989:504; 1994:5). The specimen displays a sharp and distinct mid-saggital crest that extends from 
slightly anterior to the orbit to the rear margin of the orbit. The specimen is not at all dessicated and the 
crest is quite apparent exteriorly. 
Bathycongms guttulatus (Gunther, 1887) (Fig. 24) 
Material.— CAS 235635 (male, 319 mm TL, DC-1303); HEPD-006, otter trawl in 454^57 m. CAS 
235634 (male, 417 mm TL, DC 1557); HEPD-035, beam trawl in 397-439 m. 
Remarks. — The vertebral formulae of the specimens are 11^2-154 (DC-1303) and 10-41-163 (DC-1557). 
Several species of Bathycongms remain undescribed; these specimens were identified using the key in 
Kannovskaya and Smitli (2008). 
Bathycongms retrotinctus (Jordan and Snyder, 1901) (Fig. 25) 
Material.— CAS 235455 (224 mm TL); HEPD-001; beam trawl in 238-252 m. CAS 235456 (360 mm TL, 
DC-1580); HEPD-038, traps in 355-368 m. 
Remarks.— Tliis congrid eel is readily identified by its pointed snout, dentition, D and Afm origins, and pore 
and color patterns. 
Bathylagidae (Deep-sea smelts) 
Nansenia ardesiaca Jordan and Thompson, 1914 (Fig. 26) 
Material.— CAS 234013 (135 mm SL, DC-1332); HEPD-010, beam trawl in 318-333 m. 
Remarks.— Widely distributed in the western Pacific. 
Alepocephalidae (Slickheads) 
Bajacalifornia Amaoka and Abe, 1977 (Fig. 27) 
Material.— CAS 235451 (232 mm SL, DC-1416); HEPD-016, otter trawl in 892-966 m. 
Remarks.— Formerly known only from off Japan. The HEPD specimen extends its known range to the 
Philippines. 
Narcetes kamoharai Okamura, 1984 (Fig. 28) 
Material.— CAS 235450 (276 mm SL, DC-1417); HEPD-016, otter trawl in 892-966 m. 
Remarks. — This species was originally described from off the Okinawa Islands in the Ryukyu Trench; its 
capture during the HEPD expedition extends its known range to the Philippines. One small (78 mm SL) 
damaged specimen from HEPD-014 (CAS 234025) is also probably this species. 
Gonostomatidae (Bristlemouths) 
Sigmops elongatum (Gunther, 1878) 
Material.— CAS 235475 (95 mm SL); HEPD-016, otter trawl in 892-966 m. 
Remarks. — A circumglobal, temperate to tropical species, mostly at bathypelagic depths but often taken in 
bottom trawls. 
Photichthyidae (Lightfishes) 
Pollichthys mauli Poll, 1953 
Material.— CAS 236663 (4, 40.2-46.9 mm SL); HEPD-004, otter trawl in 154-245 m. CAS 236511 (13, 
32.0-42.2 mm SL); HEPD-009, otter trawl in 322-336 m. 
Remarks.— Small, veitically-migrating, mesopelagic fish found in tropical waters of Atlantic, Pacific, and 
Indian oceans. 
Polymetnie coiythaeola (Alcock, 1900) 
Material.— CAS 235541 (9, 48.8-70 mm SL): HEPD-009, otter trawl in 322-336 m. 
Remarks.— Apparently worldwide in warm seas, commonly in 300-500 m, but sometimes to >800 m. 
