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Updated: May 10, 2025
Certain butterflies are polymorphic, and not only do the males and females of the same species differ, but the females present two distinct forms, one of which as a general rule mimics the outward appearance of a distant but highly valued species; yet the males will pair only with the females of their own kind, and not with the strangers, though these may be very likely much more like the males themselves.
Evadne is a water flea they'll make something out of Mrs. Sarah Grand next; and Autolycus, my Autolycus! is a polymorphic worm, whatever subtlety of insult "polymorphic worm" may convey. However, I wander from the microscope. These shortbread things are fussing about hither and thither across the field, and now and then an amoeba comes crawling into view.
If both have become fitted for slightly different habits of life or conditions, they might live together; and if we lay on one side polymorphic species, in which the variability seems to be of a peculiar nature, and all mere temporary variations, such as size, albinism, etc., the more permanent varieties are generally found, as far as I can discover, inhabiting distinct stations, such as high land or low land, dry or moist districts.
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