The cochleoid, whose name means ``snail-form'' in Latin, was first discussed by J. Peck in 1700 (MacTutor Archive). The points of contact of Parallel Tangents to the cochleoid lie on a Strophoid.

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**References**

Lawrence, J. D. *A Catalog of Special Plane Curves.* New York: Dover, pp. 192 and 196, 1972.

MacTutor History of Mathematics Archive. ``Cochleoid.'' http://www-groups.dcs.st-and.ac.uk/~history/Curves/Cochleoid.html.

© 1996-9

1999-05-26