may be missing. Posteriorly, several smaller replacement (?) teeth are developing mesially to 

 some of the principal fangs. In each of these two specimens the longest fangs are about half the 

 width of the end of the premaxillary. The vomer heads bear a single fang similar to and 

 continuous with those of the palatines. Teet of mesopterygoids comprise a narrow patch of 

 small, backward-curving, fanglike teeth, beginning about under anterior margin of pupil and 

 extending posteriorly to a little beyond hind margin of orbit. At the ends the patch is 2 to 3 

 teeth in width and increases to about 6 teeth near the middle. 



Photophores: The following description of photophores pertains to the lectotype; any dif- 

 ferences between it and the paralectotype are stated; Dn and Vn exposed, prominent; Dn 

 before and slightly below level of upper orbital margin; Vn a little behind a vertical from Dn 

 and slightly above level of lower orbital margin. A small Suo at posterodorsal margin of orbit, 

 nearly on same level as Dn. OP^ no larger than other body photophores; OP, a half smaller 

 than OPj, partially hidden by preoperculum, in line with and just behind end of jaw; 0P| a 

 little less than its diameter before a vertical from anterior margin of OPj. PLO half the size of 

 other body photophores, its diameter before, and its upper margin level with, pectoral origin. 

 PVO, about three of its diameters below PLO and slightly before a vertical from center of PO^; 

 PVOj below and touching bases of lower pectoral rays. A line through anterior margins of PLO 

 and PVO i passes through or behind center of PO j; a line through PVOj and PVO , passes 

 through PO,; a line through PLO and PVOj passes through P04. Five PO, unequally spaced; 

 the first pair close to ventral septum, the succeeding pairs very gradually diverging, the last 

 just before origin of outer pelvic rays; POi.- interspace nearly a photophore diameter less than 

 thatof P0:;.3but about half a diameter greater than thatof PO^.j and slightly less than half of 

 the interspace between POj..-,. The PO spacing of the paralectotype differs in that the PO1.2 

 interspace is a full diameter less than that of PO.i.4, and the PO2.3 interspace is equal to that of 



P04,5. 



VLO above and nearer to pelvic origin by about one-third the distance from there to 

 lateral septum and about on level of midpoint between PLO and OP^. Four VO, the first pair in 

 contact at ventral septum and close to inner pelvic rays; the second pair is elevated about two 

 of its diameters above the septum, the third and fourth pairs converging toward the anus, the 

 fourth its diameter from the septum and before the anus; VO1.2 interspace a photophore 

 diameter greater than those between the remaining pairs. Two SAO in steeply oblique line; 

 line through their anterior margins touches the posterior margin of VO4. SAO, two of its 

 diameters above and one behind VO^; SAOj at lower edge of lateral line scale and over base of 

 first or second anal ray. In the paralectotype, SAOj is but half a diameter behind and about 1.5 

 diameters above VO4; SAO2 is farther forward, a little before base of first anal ray. SAO 1.2 and 

 VO4 form a straight line. 



AO 7+6, each side (6 + 6, each side, in paralectotype), the series straight. The first 2 AO 

 are separated by a space equal to that between the AOa-AOp series. Pol its diameter behind a 

 vertical from last AOa, a little higher than midway between there and lateral septum, and at 

 the second lateral scale before end of adipose base. Two Pre, separated by nearly a photophore 

 diameter. The interspaces between AOai.2, AOa-AOp, and AOp-Prc are equal. No luminous 

 caudal organs present. 



Loweina interrupts 



(Taning, 1928) 



Designation and Description of Lectotype 



Although Loweina interrupta has been reported primarily from the Atlantic Ocean, and 

 but once from the southern Indian Ocean, it may eventually be found in the Pacific Ocean. 

 Regardless of its possible occurrence there, it appears fitting to deal with the species at this 

 time. 



79 



