. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 404 bulletin: museum of comparative zoology Backus of the Woods Hole Oceanographie Institution (WHOI), Dr. William J. Richards of the Washington Bureau of Commercial Fisheries (WBCF), and Dr. Gerhard Krefft of the Institut fiir Seefischerei, Hamburg, have kindly provided material in their care. I am grateful to Dr. Rolf L. Bolin of Stanford University and Dr. Giles W. Mead of the Museum of Comparative Zoology (MCZ), Harvard University, for their kindness in reviewing the manuscript and for offering valuable advice and
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 404 bulletin: museum of comparative zoology Backus of the Woods Hole Oceanographie Institution (WHOI), Dr. William J. Richards of the Washington Bureau of Commercial Fisheries (WBCF), and Dr. Gerhard Krefft of the Institut fiir Seefischerei, Hamburg, have kindly provided material in their care. I am grateful to Dr. Rolf L. Bolin of Stanford University and Dr. Giles W. Mead of the Museum of Comparative Zoology (MCZ), Harvard University, for their kindness in reviewing the manuscript and for offering valuable advice and criticism. Partial financial support from National Science Foundation Grant GF 147 is gratefully acknowledged. Abbreviations of names of luminous organs on the head, and of body photophores (Fig. 1), are as follows: Dn: dorsonasal; Vn: fiOpostenor Fig. 1. Diagram of a generalized Diaphus showing distribution of the luminous organs of the head and body photophores. Abbreviations after Tuning, 1928, slightly modified. ventronasal; So: suborbital; Ant: antorbital, a small triangular luminous organ present in several species and lying between the Dn and the anterodorsal aspect of the orbit, not shown in Figure 1; Br: branchiostegal; Op: opercular; PO: thoracic (or pectoral); PVO: subpectoral; PLO: suprapectoral; VO: ventral; VLO: supraventral; SAO: supra-anal; AOa: anterior anal; AOp: posterior anal; Pol: posterolateral; Pre: precaudal. Measurements were made as follows: standard length (s. 1.): shortest distance between tip of snout and end of hypural; head length: from tip of snout to extreme posterior margin of opercular flap; length of upper jaw: from anterior tip of premaxillary to its posterior end; eye diameter: horizontal distance between opposite margins of bony orbit; depth of head: vertical through posterior margin of orbit; depth of body: vertical through base of upper ray of pectoral fin; depth of caudal peduncle: least vertical depth; predorsal: shortest distanc
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