Rorqual Whale Side
The name given to certain whales closely allied to the common or whalebone whales, but distinguished by having a dorsal fin, with the throat and under arts wrinkled with deep longitudinal folds, which are supposed to be susceptible of great dilation, but the use of which is as yet unknown.
Logan Marshall, Ed. International Self-Pronouncing Reference Library (five vols.) (Philadelphia, PA: International Press, 1911)