. The Eurypterida of New York. Eurypterida; Paleontology. THE EURYPTERIDA OF NEW YORK 157 of preoral chelicerae in place of antennae, already inferred by Schmidt, was demonstrated,^ [see restoration pi. 3, fig. i]. The fifth segment of the second endognathite in the male carries a long, curved, tubular pro- cess [text fig. 32] which, by analogy with Limulus, Holm considered as a clasping organ employed during copulation. The epicoxite of the coxal segments before observed by Laurie in Slimonia and Ptery- gotus, was found in its proper position in Eurypterus and a circular perforation with very
. The Eurypterida of New York. Eurypterida; Paleontology. THE EURYPTERIDA OF NEW YORK 157 of preoral chelicerae in place of antennae, already inferred by Schmidt, was demonstrated,^ [see restoration pi. 3, fig. i]. The fifth segment of the second endognathite in the male carries a long, curved, tubular pro- cess [text fig. 32] which, by analogy with Limulus, Holm considered as a clasping organ employed during copulation. The epicoxite of the coxal segments before observed by Laurie in Slimonia and Ptery- gotus, was found in its proper position in Eurypterus and a circular perforation with very thin covering membrane has been observed close to the inner margin of the coxa of the fourth endognathite [see text fig. 12; pi. 7, fig. 6]. A corresponding organ in the living Limulus polyphemus was discovered by Holm on the coxae of the third and fourth endognathites near the epicoxite. On account of the structure of this organ and its position on that side of the coxa which is turned toward .the outside, it was suggested that it has an auditory fimction. This ^'fh[te ^of E^'.^'^'f irch^ri structure has also been observed by Sarle in with clasping organ of male; the long reflexed hornlike Huehmilleria SOCialis [pi. 62, fig. 5] appendage of underside. ^ . r 1 ^ ^-1 (From Holm) and by the writers m E. remipes [pi. 7, fig. 6J. A new organ was discovered, the endostoma. This consists of a small, thin, deeply emarginate shield, not clearly boimded on the sides, which formed the inner posterior margin of the mouth [text fig. 13].' Further, the con- nection of the metastoma with the ventral integument of the cephalothorax by a doublure [text fig. 14] was shownn. The distinction between male and female genital appendages was clearly elaborated and the presence demon- strated of an interior paired, curved, tubular organ connected with the ^Eurypterus scorpioides, in which the chelicerae had been found before by Laurie, is in our. view generically distinct and an Eusarcus although on
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