Jordan and Evermann. Fishes of North America. 571 



oblique series. Body moderately elongate, the bead deep and blunt, the 

 snout not half the diameter of the large eye, which is about 3 in head ; pec- 

 toral short, reaching past front of dorsal ; anal high. Open Atlantic, 

 west to 63 W., 38 N. (Liitken.) (affinis, related, to M. caninianus= M. 



pitncldtum.) 



Scupdus <(/////(-s LT-TKEN, Spolia Atlantica, n, 32, 1892, open Atlantic. 



856. MYCTOPHUM OPALINUM, Goode & Bean. 



Head 4i ; depth 4 ; eye about 2f . D. 12 ; A. 20 ; scales 40. Least 

 height of tail * height of body. Snout very short, declivous, with a 

 well-developed median keel, its length about i diameter of eye. Eye 

 large. Premaxillary reaching nearly to angle of preoperculum, broadly 

 expanded at its extremity and partly concealed by the large scales of 

 the cheek. Space between eye and hinder edge of preoperculum only 

 diameter of eye. Origin of dorsal much nearer tip of snout than to root 

 of caudal, midway between snout and adipose fin, over eleventh scale of 

 lateral line and very slightly behind vertical through origin of ventral; 

 length of dorsal base I that of head ; origin of ventral under tenth 

 scale of lateral line ; it does not reach to vent ; pectoral short, its length 

 nearly | that of head; adipose dorsal present, its origin over thirtieth 

 scale of lateral line ; anal origin under eighteenth scale of lateral line, 

 the end of its base under thirtieth scale; length of anal base equal to 

 that of head; caudal rather small, moderately forked. Mediolateral 

 photophores 3, in straight, obliquely ascending line ; anterolateral 1 ; 

 posterolateral 1, under soft dorsal and over and slightly in advance of 

 break in row of superanals, which is above root of last ray of anal. Num- 

 ber of superanals 8 + 6. In most of the specimens examined, the 6 or 8 

 scales on the top of the caudal peduncle, immediately in front of the 

 caudel fin, are luminous. (Goode & Bean.) Western Atlantic, (opalinus, 

 like opal.) 



Myctophum opalinum, Goot)K & BEAN, Oceanic Ichthyology, 72, fig. 81, 1895, Gulf Stream. (Type, 

 No. 43808. Coll. Albatross.) 



857. MYCTOPHUM HUMBOLDTI (Risso). 



Head 3| ; depth 5 ; eye 3, large. D. 12 to 14 ; A. 20 to 22 ; scales 40 to 

 42. Caudal spots 2, near together and horizontally placed ; one postero- 

 lateral spot ; supra-anal spots 3, forming an obtuse angle with the apex 

 forward ; anal spots about 8 + 8, the series slightly interrupted Body 

 moderately elongate, with slender caudal peduncle, the snout rather 

 blunt, not projecting beyond the mouth; preopercular margin slightly 

 oblique. Pectoral long, reaching middle of dorsal and middle of 

 length of ventrals. Least depth of tail f of height of body; depth 

 of head 1| in its length. Distance between posterior margin of orbit 

 and preopercular edge i diameter of eye. Snout short, obtuse, its 

 upper profile descending in strong curve. Maxillary reaching nearly 

 to angle of preoperculum, and slightly dilated behind. Origin of dorsal 

 somewhat nearer to end of snout than to root of caudal, above root of 

 inner ventral rays ; its last ray before vertical from origin of anal ; pec- 

 toral long, extending to posterior third of ventral. Scales smooth, stiff. 



