An Evening in Camp among the Omahas

A. C. Fletcher
1885 Science  
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more » ... out Early Journal Content at http://about.jstor.org/participate--jstor/individuals/early-journal--content. JSTOR is a digital library of academic journals, books, and primary source objects. JSTOR helps people discover, use, and build upon a wide range of content through a powerful research and teaching platform, and preserves this content for future generations. JSTOR is part of ITHAKA, a not--for--profit organization that also includes Ithaka S+R and Portico. For more information about JSTOR, please contact support@jstor.org. 88 S CIE recent scorpions this segment is not visible in any position (at least, not in any which I have examined), there being only five ventral plates of the abdomen; while here there are six in sight, which are almost exactly coincident with the dorsals in position. Another feature, I feel, ought to be noticed here. In recent scorpions the tail-segments seem as if reversed in position; that is, when straightened out on a plane with the abdomen, what would appear as the dorsal sur-/face is below, and the bend of / the articulations is upward. / In this one it has been exactlv the reverse; the undei / surface, as shown on the specimen, presenting only the two longitudi-. --nal ridges, and show-/ ing also the sinus at the posterior part of the segments oc-s/ cupied by the chitinous portion of the joint. The Swedish \ \ .-specimen w o u I d also appear to present this feature, as \ the upper surface, as figured on Thorell and Lindstrom's plate, shows the four ridges of the dorsal side of the tail-segments. The proportionate breadth of the body would indicate the \ American individual as a female, as it is of an elongate, oval form, being half as wide across the fourth dorsal segment as the entire length of the abdomen. The geological horizon to which this American specimen belongs is that of the water-lime group, at the extreme base of, or perhaps more properly below, the lower Helderberg group (equivalent to the Onondaga salt group of central and western New York), and is nearly the same as that from which the Swedish specimen was obtained, probably somewhat lower. The associated fossils are Eurypterus remipes DT.Kay, Dolichopterus macrocheirus Hall (only lately obtained from this locality), Pterygotus Osborni Hall, and Leperditia alta Conrad. In other parts of the state, other forms of Eurypleri are found; also Ceratiocaris, with a very few molluscan forms,all indicating a marine deposit. The fossils associated with the Swedish specimen are closely similar to the above in part. But many of the 88 S CIE
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