. The Eurypterida of New York. Eurypterida; Paleontology. 428 NEW YORK STATE MUSEUM Rooker farm, Pithole City, Venango cc, Pa. The outline is quite reg- ularly semicircular; the posterior parts of the lateral margins slightly concave and the postlateral angles slightly produced but not into distinct mucros as in the original figure. The eyes are small (between one fourth and one fifth the length), the nodes prominent. They are separated b}' a distance about one half the breadth of the carapace. As in other speci- mens from sandy beds, the glabellalike ridge of the middle of the carapace is wel
. The Eurypterida of New York. Eurypterida; Paleontology. 428 NEW YORK STATE MUSEUM Rooker farm, Pithole City, Venango cc, Pa. The outline is quite reg- ularly semicircular; the posterior parts of the lateral margins slightly concave and the postlateral angles slightly produced but not into distinct mucros as in the original figure. The eyes are small (between one fourth and one fifth the length), the nodes prominent. They are separated b}' a distance about one half the breadth of the carapace. As in other speci- mens from sandy beds, the glabellalike ridge of the middle of the carapace is well preserved between the eyes and bears a distinct circular ocellar mound just back of the lateral eyes. This species is probably closely allied to E. mansfieldi. HUGHMILLERIA: VENTRAL SURFACE OF THE CEPHALOTHORAX The chance exposure of the lower side of the cephalothorax in this genus has brought out a structure which none of the material before exam- ined has displayed and an illustration of the details of this structure is here given. In the anterior median j)osi- tion lies a relatively long plate resembling ^^ an inverted lyre, which is identical with the object described by Sarle and reproduced ;, elsewhere by ourselves as the supposed metastoma of Dolichopterus ? ?" It is the cpistoma. It is bounded by sharp sutures on the lateral margins and terminates with its bilobate portion in front of the mouth. On its posterior lobes are two sharply out- t«'ofU°ntr!ii li^cd circular scars indicating either the aurface of carapace, e, epistoma; as, attachment . , i , j- i , , , scars of clielicerae; ah. antelateral shield; ms, attachment OI mUSClCS Or mOrC probablv marginal sbiekl; /^, impression of the lateral eye; ^ ^d, posterior doublure, x 4/3 the bascs of thc clielicerac. This epistoma is flanked by two semielliptic plates, the antelateral shields, which in their turn are separated by distinct sutures from the marginal shields at the sides. The latter show a clavate widen
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Keywords: ., bookcentury1900, bookdecad, booksubjectpaleontology, bookyear1912
