Page:The Eurypterida of New York Volume 1.pdf/377

 margin that corresponds to the doublure. The anterior region is covered with small linear or bean-shaped scales which in posterior direction become first crescentlike and then angular, increasing at the same time in size and decreasing in distinctness.

The coxae of the swimming legs bear small, widely distributed crescentic to circular scales that are directed outward. The other paired limbs show small crescentic scales on the basal segments and longitudinal lines of sharply angular scales on the distal segments.

The metastoma and the hastate part of the female opercular appendage are also provided with crescentlike scales.

On the sternites the scales become smaller, but very densely crowded, more prominent, and show an ever increasing tendency in posterior direction to become circular. The last tergite is covered on its anterior half with strongly raised, evenly distributed, black, round tubercles. Similar small circular scales are also observed near the anterior margin of the telson which otherwise is smooth.

Measurements. As we have at our disposal only two complete specimens, and these represent but immature individuals, the measurements of the mature specimens have been obtained by a series of proportions. We give first the measurements of specimen, plate 72, which is the best preserved of the complete individuals.