THE MAMMALS 235 
only in external form. The cylindrical body has no distinct 
neck, the comparatively large head uniting directly with 
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the cylindrical body, which terminates in the tail with hori- 
zontally placed fins. No external signs of hind limbs exist, 
Attains a length of seventy feet. 
Fie. 188.—Humpback whale (Megaptera versabilis). 
