. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. parr: myctophinae 47 number and arranged in an equally curved series ending with the upper PRC alwut 1-2 diameters below the end of the lateral line. The inter- space between the third PRC and the fourth is somewhat Fig. 3. Lampanyctus leucopsarus (Eigenmann and Eigenmann) Table of measurements of type sample Total length without caudal fin in mm. Length of head In percent of length without caudal fin Diameter of eye Length of lower jaw Depth of body ^ Snout to D Snout to V Snout to A 77 72 30 28 20
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. parr: myctophinae 47 number and arranged in an equally curved series ending with the upper PRC alwut 1-2 diameters below the end of the lateral line. The inter- space between the third PRC and the fourth is somewhat Fig. 3. Lampanyctus leucopsarus (Eigenmann and Eigenmann) Table of measurements of type sample Total length without caudal fin in mm. Length of head In percent of length without caudal fin Diameter of eye Length of lower jaw Depth of body ^ Snout to D Snout to V Snout to A 77 72 30 28 20 21 18 17 47 47 43 43 60 58 The question of the presence or absence of the VLO in this and the closely related species L. nannochir has already been discussed by the writer in a previous publication^ in which the suggestion is made that the so-called VLO in the latter species may actually be homologous with the second VO in L. leucopsarus, the photophore in question having become still further advanced and elevated than in the last named form. Under this interpretation, both species could be said to have five VO and to have lost their VLO. But for practical purposes it is perhaps advisable to apply the nomenclatural symbols in the conventional manner according to the relative positions of the organs alone, in which case a VLO but only 4 VO could be said to be present 1 This measurement is hardly very reliable in the type specimens, as they appear to have been artificially compressed in preservation. 2 A. E. Parr. Notes on the species of Myctophine Fishes. . Proc. U. S. National Mus., 76, Art. 10, p. 18 footnote Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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