. The Eurypterida of New York. Eurypterida; Paleontology. THE EURYPTERIDA OF NEW YORK 43 the limbs of Limulus andtheeurypterids that are among the strongest proofs of their intimate relationship. The six pairs of limbs are currently divided into the preoral (the first) and postoral (the following five pairs). The preoral limbs are the chelicerae or mandibles, the postoral the walking, and burrowing or swimming legs. Be- sides these the mouth is surrounded by platelike appendages, functioning as lips. These are the epistoma, endostoma and metastoma. a The chelicerae in Limulus are small [see te
. The Eurypterida of New York. Eurypterida; Paleontology. THE EURYPTERIDA OF NEW YORK 43 the limbs of Limulus andtheeurypterids that are among the strongest proofs of their intimate relationship. The six pairs of limbs are currently divided into the preoral (the first) and postoral (the following five pairs). The preoral limbs are the chelicerae or mandibles, the postoral the walking, and burrowing or swimming legs. Be- sides these the mouth is surrounded by platelike appendages, functioning as lips. These are the epistoma, endostoma and metastoma. a The chelicerae in Limulus are small [see text fig. lo] and consist of three segments, the much compressed but relatively long basal segment and the two forming the pincers or chelae. The basal joint articulates, as Holm has pointed out, with an impaired, lanceolate plate placed between the coxal segments of the first pair of walk- ing legs. The preoral appendages of the eurypterids exhibit great differentia- tion. They are smallest in Eurypterus, where they have been described in detail by Holm and have proved to \| have almost the exact structure of ^^S^^^ i° Limulus polyphemus; female, irom ventral surface those in Limulus. We figure here the ab, abdomen; an, anus; ch, chelicera; chi, chi- cheHcerae of E . remipes and E. ^^f'"!= '/' cephaiothorax; oi, olfactory r organ; op, operculum; sp, spme. (From lacustris [plate 7, figure i, and McMurrich) plate 12, figure i] which verify Holm's observations. Those of Stylonurus have a like structure and similar relative size as shown by Hall and Clarke [seeimder S. excelsior]. Eusarcus had similar chelicerae which, how-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Clarke, John Mason, 1857-1925; Ruedemann, Rudolf, 1864-1956. Albany, New York State Education Department
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Keywords: ., bookcentury1900, bookdecad, booksubjectpaleontology, bookyear1912
