as rows of fine teeth. The segments forming the arm or pole of the swimming legs are rather short, ringlike and broad with intricate articulations, none of which however is well preserved. The seventh and eighth segments form a much lengthened but little broadened blade; the seventh segment is about one and one half times as long as wide and occupies nearly one third of the length of the arm beyond the coxa. The proximal extremity is deeply notched for the articulation with the preceding segment; the lobelike plate, marked off from the inner distal margin by a suture, is rounded and occupies half the width of the segment. The palette is a long subelliptical body, twice as long as wide; its distal extremity slightly convex, the inner nearly straight. It carries at its distal extremity a nearly circular claw of relatively great size (one fourth the length of the palette) so snugly fitted in a corresponding notch that it is discerned with difficulty. The edges of the blade are furnished all around with small serrae.
The metastoma has not been seen.
Genital appendages. The only trace of a genital appendage seen is a small oval area which suggests an immature female appendage.
Ornamentation. The preservation of most of the material is such that the substance of the integument is a finely puckered carbonaceous film obscuring all former surface ornamentation. In the smallest specimen the impression of the postabdomen shows small elongate elliptic scales of the character of those in E. scorpionis [pl. 39]. On the sternites and the carapace of the same specimen traces of small circular markings are also observable, suggesting that on the whole, the ornamentation of this form was little different from that of E. scorpionis.
Horizon and localities. All representatives of this species have come from the Kokomo waterlime horizon at Kokomo, Indiana.
Remarks. A survey of the specimens figured[1] shows that they form
- ↑ A fifth still smaller specimen is in the National Museum. This is so poorly preserved that it is not capable of furnishing positive data. It is, however, of interest in suggesting that the telson was considerably longer than indicated by the other specimens and probably also curved as in the other species of Eusarcus [see pl. 36, fig. 11].
