PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 343 



(13) more tlian half, that of the head. The teeth are miuute, hi single 

 rows, closely set in the jaws, somewhat stronger upon the blind side. 

 A strong short spine above the snout, at the anterior termination of tlie 

 ridge at the lower margin of the upper eye. Hence the specific name 

 unicornis. 



The dorsal fin begins at the side of the preorbital spine, its anterior 

 rays being slightly crowded over upon the blind side. It is composed 

 of 73 to 75 simple rays. Its greatest height (13) is half the length of 

 the head. 



The distance of the anal from the snout (33) is one-third of the stand- 

 ard length. The number of rays is GO; their longest (13) equal in length 

 to the longest dorsal rays. 



The caudal is pointed, triangular, subsessile; its length (22) twice that 

 of the maxillary (11) and two-thirds the distance from the snout to the 

 anal (33). The pectorals are inserted far below the lateral line. The 

 pectoral of the colored side is twice as long (18) as the diameter of the 

 eye, that of the blind side as long (13) as the longest dorsal rays. The 

 former is composed of 10 rays, the latter of 4. 



The length of the ventrals (11) is half that of the caudal. They are 

 asymmetrically j^laced, as is described under the generic diagnosis. 



Eadial formula : D. 73-75 ; A. 60; P. 4 right, 10 left ; L. lat. 40. 



Color ashy gray, with dark lateral line. Eyes black. 



Current number of specimen. 

 Locality 



26,003. 

 870 and 871. 



Milli- 

 meters. 



Extreme lenitli 



Lenutli to origin of middle caudal rays . . 

 Body : 



Greatest height 



Least height" of tail 



Head : 



Greatest length 



] )istiince from snout to upper eye 



Distance from snout to lower eye 



^Vidth of interorbital area 



Lengt li of snout 



Length of maxillary 



Length of mandible 



Diameter of orbit, longitudinal 



Dor.snl (.siiinous) : 



Distance from snout 



Greatest height 



Anal : 



Distance from snout 



Height at longest ray 



Caudal : 



Length of middle rays 



Pectoral : 



Distance from snout 



Length 



Ventral": 



Distance from snout on colored side 



Length 



Dorsal 



Anal 



Pectoral 



Number of scales in lateral lino 



lOOthsof 

 length. 



4E. 



28 

 18-13 



26 

 11 

 75-73 

 60 

 , lOL. 

 40 



