Page:The Eurypterida of New York Volume 1.pdf/64

 of Limulus than to that of Thelyphonus, we must not forget that Holm has found important corroborative evidence for his sex determination of the male in the clasping organs of the second endognathites.

Accepting the determinations of Woodward, Schmidt and Holm, the female appendage consists of two single lobes and two paired terminal

pieces. The first of the single lobes is the largest; it is pointed in front, where it extends between the pentagonal basal pieces, with which it is connected by sutures. The middle portion is found occupying the space between the lateral opercular plates which here do not meet in the median