16 ART. 7. — S. TANAKA : 



The following is a detailed description of the species. 



Head measuied from tip of snout to gill opening contained 

 4| in total length, excluding the parts from the end of second 

 dorsal to the end of caudal filament ; greatest height of body in 

 front of the posterior end of the base of first dorsal 5 to 6 ; 

 snout 2 in head ; eye 3? ; interorbital 5 ; height of head behind 

 eye lower than the greatest height of body ; front of eye almost 

 midway in length of head ; eye large, elliptical, its diameter 

 longer than the interorbital width ; snout rather pointed. Spine 

 of first dorsal so damaged that it remains uncertain whether it 

 exceeds tip of first ray of first dorsal or not ; it is triangular in 

 cross section ; keeled in front, grooved behind, the lateral borders 

 of the distal part beset with curved spines directed backwards 

 and downwards, but the degree of the spinous roughness is uncer- 

 tain on account of the rather bad state of preservation. Anterior 

 angle of free margin of soft part of first dorsal acute, the margin 

 being almost straight ; the soft portion of the first dorsal and 

 the membrane joining it to the second are contained in a deej:» 

 groove as in all the species of Chimœra known in the waters of 

 Japan ; height of the anterior ray of first dorsal exclusive of its 

 fleshy base Ih to 1^ in head, inclusive of the base li to 11. 

 The second dorsal rises rapidly, reaching its greatest height 

 behind tip of pectoral where the height measured perpendicular 

 to base is 4^ to 5f in head ; free margin even, almost straight ; 

 posterior part of the margin rather lower, but again higher near 

 dorsal notch ; posterior angle rounded where it makes a deep 

 dorsal notch, but is not cleft to base of fin. 



Caudal produced to a rayless filament ; distance from the 

 dorsal notch to the end of caudal filament about 2 in body ex- 

 clusive of head and the parts behind dorsal notch, agreeing in this 



