Genus Bathophilus Giglioli 196 B. brevis Regan & Trewavas 199 B. altipinnis Beebe 203 B. metallicus (Welsh) 205 B. longipinnis (Pappenheim) 208 B. chironema Regan & Trewavas 209 Genus Eustomias Vaillant 210 E. obscurus Vaillant 217 E. bibulbosus Parr 219 E. simplex Regan & Trewavas 221 E. dubius Parr 222 E. lipochirus Regan & Trewavas 224 E. bigelowi Welsh 225 E. silvescens Regan & Trewavas 228 E. schmidti Regan & Trewavas 230 E. fissibarbis Pappenheim 232 IV. Bibliography 233 Introduction.For detailed data in regard to nets, locality, dates, etc., concerning the capture of the deep-sea fishes treated in this monograph, refer to Zoologica,