FISHERY BULLETIN: VOL. 78, NO. 1 



terior and anterior crests absent (Figure 28); 

 integument as in M.johnsoni. 



Gill opening exceptionally large, greatest 

 diameter 23.47f SL; number of upper jaw teeth 91; 

 vomerine teeth 8; dorsal fin rays 15; pectoral fin 

 rays 16 (Table 2). 



Etymology. — The name eustalus is derived from 

 the Greek eustales, an adjective meaning well 



equipped, in reference to the enormous esca of this 

 ceratioid. 



Luminescence. — Upon capture, the holotype of 

 Melanocetus eustalus was maintained alive for 

 several minutes during which the bulb of the esca 

 glowed continuously with a bright, golden-orange 

 light. The amount of light actually emitted, how- 

 ever, appeared to be controlled by an up and down 





80 



FIGURE 28.-Holotype of Melanocetus eustalus, LACM 30037-12, 111 mm SL, lateral view. Drawn by Elizabeth Anne Hoxie. 



