124 MR. R. LYBEKKER ON [Feb. 21, 



ft. in. 



Anterior margin of pectoral fin along the curve. 1 3 



„ ,, dorsal 1 34 



Tail- flukes along the curve 1 3 



Expanse of tail 1 7| 



Beak fi'om groove which separates the forehead 5 



Genital groove 5 



Anal opening 1-j 



Gape of mouth 11 



Greatest breadth 1 Oj 



„ height 1 Oi 



„ circumference 3 2| 



Smallest circumference 10 



Height of dorsal fin 8^ 



Length of dorsal fin at base 1 



Greatest circumfei'ence lOg 



Smallest circumference 6| 



Lower jaw about half an inch longer than upper. Colour blue- 

 black, paler at the sides ; beneath fleshy grey. Lower jaw dull 

 grey ; a dark blue band, same as the smaller specimen, but less 

 clear. Genital and anal regions fleshy pink. 



Teeth ^ and f^ = 55 and 53. 



Zo Zl 



Vertebras: 0. 7, D. 12, L. 16, Ca. 23 = 58. 

 Ribs 12, of which five are two-headed. 

 Pterygoids not in contact. 



The following are the particulars of the 1 904 specimen sujiplied 

 to me from the Trevandi'um Museum : — 



ft. in. 



Extreme length 6 1 



From tip of beak to origin of dorsal fin 2 7^ 



„ „ ,, flipper 1 5 



„ „ anal opening 4 3 



Length of flipper round the outer curve 1 2 



,, dorsal fin 1 1 



Expanse of tail-flukes 1 4| 



Greatest height, including dorsal fin 1 6| 



Height of body 1 



Greatest gii'th 3 3 



Smallest girth 9 



Lower jaw somewhat protruding. 



Colour. Upper surface, flippers, and sides of tail glistening 

 dark brown, abruptly passing into dull silvery grey (paling into 

 light sea-green after skinning) on the sides ; facial region paler ; 

 under side dull pearly white, extending to a little behind the anal 

 opening; orbits in a dark brown oval blotch, which gradually 

 fuses into a tapering band running above and pai'allel to the basi- 

 rostral groove and uniting at the angle of the (V-shaped) prenarial 

 adipose elevation, from wliich four dark faint lines diverge towards 



