. Annual report of the Board of Regents of the Smithsonian Institution . Pig. 26.—Type of the family Aceratiids (Accratias macrorhinus). After Brauer. reduced in size and far back; the ventrals absent. The illicium isentirely suppressed, but the interspinal bone appears to be developed,though mostly concealed beneath the skin.* Instead of the lantern-like or phosphorescent bulb of the illicium manifest in the Ceratiids,the nasal capsules of the Aceratiids are peculiarly developed andmay perhaps exhibit phosphorescent emanations. No species of this group were known till the present decade andth
. Annual report of the Board of Regents of the Smithsonian Institution . Pig. 26.—Type of the family Aceratiids (Accratias macrorhinus). After Brauer. reduced in size and far back; the ventrals absent. The illicium isentirely suppressed, but the interspinal bone appears to be developed,though mostly concealed beneath the skin.* Instead of the lantern-like or phosphorescent bulb of the illicium manifest in the Ceratiids,the nasal capsules of the Aceratiids are peculiarly developed andmay perhaps exhibit phosphorescent emanations. No species of this group were known till the present decade andthe cruise of the deep-sea expedition of the German steamer Figs. 27, 28.—Side and front views of the head of Aceratias indicus. After Brauer. On overhauling the fishes of the expedition sj^ecimens were found byDr. A. Brauer, noticed in 1902, and later (1908) referred to a newfamily. Three forms of the family have been described by Doctor Brauer,all obtained from depths of 1,000 fathoms or more—one in the Atlan-tic Ocean and two in the Indian Ocean. All the specimens wereyoung, being less than an inch long. Doctor Brauer has not described an interspinal bone, but his figure (PI. XVI,figs. 8 and 9) seem to represent one; so, at least, I am tempted to interpret theillustrations. 588 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1908. THE OGCOCEPHALIDS OR MALTHIDS. The family Ogcocephalids, or bat fishes, is in some respects, at least,the most distinctly differentiated family of the Pediculates. Thehead is large and much depressed, and, in most of the species, pre-sents considerable superficial appearance to that of the anglers, butthe branchial ape
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