These spots are irregular in shape, but are inclined to be elongated with their axis twisting to the right, so that when a series of eggs is viewed looking toward the larger end, the spots produce a clockwise spiral. Some of these spots are more twisted than others, but on a few eggs there are no spiral tendencies at all. The surface spots are quite variable in color, dependent largely on the thickness of the pigment deposited, for where the latter is thin the true color is observable, but when the decoration is liberal, the blot becomes opaque and the color is lost. These spots range from "auburn" and "raw umber" to "chestnut brown" and "blackish brown." The underlying spots are well hidden by the boldness of the surface markings and inclined to be small and regular and are often more or less numerous. Their shades are delicate, ranging from "pallid gray" to "mouse gray." An occasional egg exhibits scattering insignificant additional markings of deep "blackish brown." The measurements of 145 eggs average 36.3 by 25.3 millimeters; the eggs showing the four extremes measure =40.1= by 25.9, 39.2 by =26.5=, =34= by 25, and 34.5 by =23.5= millimeters. _Young._--Both sexes incubate and are rather close sitters, as well as devoted and bold in the defense of their young. The period of incubation is probably the same as for the European dunlin, 22 days. John Murdoch (1885) says: Both parents share in the work of incubation, though we happened to obtain more males than females with the eggs. The young are pretty generally hatched by the first week in July, and both adults and young keep pretty well out of sight till the 1st of August, when they begin to show about the lagoons and occasionally about the beach, many of the young birds still downy about the head. The autumn flight of young birds appears about the middle of August, associating with the young _A. maculata_ and _M. griseus scolopaceus_, in good-sized flocks, particularly about the pools on the high tundra below Cape Smythe. They continue plenty in these localities, sometimes appearing along the beach, for about a week, when the greater part of them depart, leaving only a few stragglers that stay till the first few days of September.