Figure 136 — Head of Taaningichthys paurolychnus , 69.0 mm, showing extent of whitish crescent on 



posterior portion of iris. 



fresh material, most specimens requiring nearly two hours in preservative (10% formalin) 

 before attaining the maximum state of whiteness. 



On specimens of T. paurolychnus in excellent condition there is often a domed covering of 

 a transparent, viscous substance over both the supra- and infracaudal luminous glands (Fig. 

 137). Either this dome is quite fragile or the viscous substance is readily dissolved in preserv- 

 ing fluids (lO'/f formlin followed by 40% isopropyl alcohol) for in several specimens that 

 originally had this structure it is now collapsed. 



Lampadena Goode and Bean, 1896 



Large, very silvery, undivided luminous glands, usually set rather deeply into vertical 

 surfaces of caudal peduncle in both sexes. No crescent of luminous tissue on iris. Vn small, 

 inconspicuous; Dn absent. PO series linear, except in one species in which PO4 is highly 

 elevated. Usually 5 VO, but variably 4 to 6, none markedly elevated. SAO in a steep, slightly 

 angulate line, usually in series with last VO. One Pol; 3 Pre, the upper at end of lateral line. 

 Dorsal and anal fin bases not overlapping; base of adipose fin over or slightly behind end of 

 anal base. Procurrent caudal rays stiff, spine-like. 



Nafpaktitis and Paxton ( 1968) presented a review of the genus Lampadena from all 

 oceans and included a key to identification of seven species, one new; of these, five are known 

 to occur in the eastern Pacific Ocean, and the other two may eventually be found in the poorly 



149 



