page 158: "usually" changed to "unusually" (These unusually marked animals should stand out in repeated encounters ...)
page 161: "vessle" changed to "vessel" (2 right whales directly ahead of vessel headed NE ...)
page 166: added closing parenthesis "(in cross section circular, or slightly flattened anteroposteriorly)".
page 168 (Footnote 20): "feet" changed to "feel" (... one can feel the point at which the two lower jaws become united)