22(5 



PITHOEA. 



scurely cloven. Tail forked, acute, of 

 eighteen rays, one of which on each side 

 is very long and simple, the others gra- 

 dually shorter, twice forked, some of them 

 still more subdivided. Anal fm of eleven 

 rays, like those of the dorsal one, the ex- 

 ternal ones longest, as in that, both fins 

 appearing forked when unexpanded. Ven- 

 tral fins of nine rays each, one of them 

 long and simple, the rest, as in the fore- 

 going, gradually shorter, the last being 

 cloven. These fins are not forked when 

 unexpanded. Brachial (or pectoral) fins 

 of seventeen rays like those of the forego- 

 ing, except that each is much shorter than 

 its preceding neighbour, the ultimate one 

 being scarcely discernible. Scales in seven- 

 teen rows on each side, including the dorsal 

 and ventral rows in each reckoning, other- 

 wise only fifteen. In the tenth row the 

 lateral line is marked by a minute ovate- 

 oblong dot on each scale of a silvery white, 

 so that there are about fifty such dots on 

 each side. The dorsal fin is blackish, the 



