However, the seven undamaged specimens before me all have a well-developed, but often 

 obscure, Dn. 



Loweina 



Fowler, 1925 



Distance from snout to origin of dorsal base greater than that from dorsal origin to end of 

 vertebral column. Deeply buried, often indistinct, Suo present behind posterior end of supraor- 

 bital bone, at about the level of Dn. PLO slightly below pectoral origin; 5 PO (rarely more); 2 to 

 4 VO; no PO or VO elevated. Two or 3 SAO in an oblique straight line that passes through or 

 near VO4; 1 Pol; 2 Pre closely spaced in a horizontal line. Lateral line incomplete, the external 

 pores (perforated scales) seldom extending much beyond a vertical from pelvic origin. Supra- 

 caudal luminous gland of males single, large, filling half or more of the supracaudal space. 

 Females bear no caudal luminous glands. 



Key to species of Loweina 



la. Three SAO 2 



lb. Two SAO, widely separate. PVO, behind a vertical from posterior margin of PO2 3 



2a. Four VO. PVO, behind a vertical from POj L. terminata 



2b. Two VO (abnormally 3 but never 4), 1 near pelvic base, 1 near anus. PVO, before a vertical 



from PO2 L. interrupta 



3a. Head length 297f (27-31) of SL; head depth 65% (61-69) of head length. Hind margin of 



operculum extends well past origin of pectoral fin L. laurae 



3b. Head length about 25% of SL; head depth about 73% of head length. Hind margin of 



operculum barely reaches to PLO, well short of pectoral origin L. rara 



Loweina terminata 



Becker, 1964 



Fig. 64 — Loweina terminata. holotype, male, 28.0 mm. From Becker (1964a. p. 19, fig. 2). 



Description 



D. 12 (11-13); A. 16 (15-17); P. 11 (9-12); AO 6 (5-8) + 5(4-7), total 11 (10-13); gill rakers 2 

 -1-1 + 6 (5-7), total 8-10; 38 (39-42) (sic) scales over lateral line— only the anteriormost 2 or 3 

 are perforated, (data from Becker, 1964a); vertebrae? 



Three SAO in a steeply oblique, generally straight line and in series with VO4. SAO2-3 

 interspace about twice that of SAO,. j. AOa,.> interspace but little greater than those of remain- 

 ing AOa. Only 2 or 3 perforated lateral line scales. 



A single, large undivided supracaudal gland, without a dark margin, extends from first 

 procurrent caudal ray to end of base of adipose fin (Fig. 64). 



70 



