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On the California coast, in May and June the season is at its height. -However, females with eggs in young stages have been found as late as October. Females carry their eggs for a period of four to five months. It appears that in general, mating of the California forms takes place in the late spring or early summer, although females with eggs are found throughout the year.
The breeding season for this form in the Woods Hole, Mass., region has not been accurately determined, although females with eggs have been found in July and August (Bumpus, 1898).