io8 



tely behind it the long anal. On each side of the base of the 

 dorsal and anal, between two following rays, a short, curved, 

 spine-like process, belonging to the ray in front of it, from 

 the base of which it develops. Most rays of dorsal and anal 

 simple. Teeth in intermaxilla and mandible large, quadrangular, 

 bicuspid, depressible, arranged in groups, increasing in each 

 group in size from forward to backward, those in the maxilla 

 small, close-set. A few teeth on vomer, palatines and tongue. 

 A postorbital revolving luminous organ. On each side a ven- 

 tral series of fixed organs, from isthmus to caudal; a lateral series 

 from gillopening to middle of anal, besides numerous ones 

 scattered on head and body. Four gills. No pseudobranchiae, 

 nor gillrakers. Branchiostegal rays numerous. 



i. Idiacanthus fasciola Ptrs. 



Idiacanthus fasciola Peters, Monatsber. Akad. Berlin, 1876, p. 847. 

 Idiacanthus fasciola Brauer, Deutsche Tiefsee-Exp. Tiefseefische, 1906, p. 60. 

 Idiacanthus fasciola Max Weber, Siboga-Exp. Fische 1913, p. 15. 



Fig' 37' Idiacanthus fasciola Ptrs. (after Brauer). 



B. 1516; D. 6367; A. 4045; V. 6. 



Height 40 45, head more than 14, eye about 5 ! / a or more. 

 Snout equal to eye or shorter, on the interorbital space two 

 diverging crests. Barbel twice as long as head. Origin of dorsal 

 nearer to ventrals than to posterior margin of head. Ventrals 

 shorter than head. Intermaxillary with 13 15 unequal teeth, 



