100 MARINE MAMMALS OF THE NORTH-WESTERN COAST. 
white and black marks between the vent and the flukes, in or near the mesial line 
on the under side of the body ; a lanceolate white patch extending on the ventral 
side, from the middle of the under jaw to the anterior angle of the vulva? ; a nar- 
row white strip extending from the corner of the mouth backward, on each side, 
slightly arched above the pectoral, and then curving downward gradually, the two 
meeting below in the region of the vent. Another, still narrower and somewhat 
obscure, starts at the same place with the last, but is soon lost in the white ven- 
tral patch before alluded to. Appended are the dimensions, in feet and inches, of 
the examples above mentioned : 
No. 1. No. 2. 
Total length of animal 6 7A 6 9 
Anterior edge of pectorals 1 1 
Posterior edge to angle of truncation 8 8^ 
Breadth of pectorals 3£ 3| 
Expansion of flukes 1 G 1 5i 
Longitudinal width 5 6 
Height of dorsal fin 7 7£ 
Length of dorsal fin along the back 8 J 1 
Tip of beak to anterior edge of pectorals 1 8 1 8 
Tip of beak to anterior edge of dorsal fin 3 3 1 
Tip of beak to corner of mouth Hi 1 Of 
Tip of beak to eye 1 1 1 If 
Tip of beak to spiracles , 1 2 1 3 
Width of spiracles 1£ 1£ 
Notch of flukes to vent 1 8£ 111 
Notch of flukes to teats 1 1\ 1 2 
Length of vulva and genital slit 4 5 
Circumference behind pectorals 3 1$ 3 
Circumference at genitalia 2 3^ 2 1\ 
Circumference before the dorsal fin 3 4 3 3 
Height from eye to top of head ( straight line ) 3f 4i 
Height from eye to under side of throat ( straight line ) 4 4 
Height from pectorals to top of back ( straight line ) 9 10 
Height from corner of mouth to top of head ( straight line ) 4$ 4f 
Height from corner of mouth to underside of throat ( straight line ). . . 3 3 
Height of small close to the flukes 3 4 
Centre of eye to ear ( one inch below eye ) 2 2 
Weight of animals (avoirdupois), respectively, one hundred and one hundred 
and sixty -one pounds; weight of brain, two pounds. 
The Delphinus Bairdii may be considered symmetrical in its proportions. It 
moves through the water with great swiftness and grace. 
