. Catalogue of casts of fossils, from the principal museums of Europe and America, with short descriptions and illustrations. Fossils. 9G ART1GULATA. pair were dilated into paddles. The basal joints of the first four performed the work of mastication as in the King-Crab. This specimen was found in the Wa- terlime Group (Upper Silurian), Williainsville, Erie Co., N. Y. Size, 9x9. Price, § No. 368. Euryptems laCHStris, Harlan. This specimen, from the same locality, is of medium size, and lies with the dorsal side exposed. The carapace has been detached. The body is curved, and the tail dire
. Catalogue of casts of fossils, from the principal museums of Europe and America, with short descriptions and illustrations. Fossils. 9G ART1GULATA. pair were dilated into paddles. The basal joints of the first four performed the work of mastication as in the King-Crab. This specimen was found in the Wa- terlime Group (Upper Silurian), Williainsville, Erie Co., N. Y. Size, 9x9. Price, § No. 368. Euryptems laCHStris, Harlan. This specimen, from the same locality, is of medium size, and lies with the dorsal side exposed. The carapace has been detached. The body is curved, and the tail directed forward. Size, 7x6. Price, § No. 369. Emypteras remipes, De Kay. The carapace of this species is more attenuated, being about three-fourths as long as wide, and the tail-spine is somewhat slender and triangular in form. From the same locality as the two preceding. Size, 13 x 10. Price, i$ No. 370. Fterygotus acuminatas, Salter. This genus was established by Prof, Agassiz in 1844. It derives its name from the peculiar charac- ter of its foot-jaws, which, from their scale-like sculp- ture, were at first mistaken for the remains of a Fish. Like the Eurypterus, the P. may be described as a " lobster-like Crustacean," since it has an elongated body composed of a cephalo-thorax, an abdomen with a dozen segments, and a tail-plate. It differs from the Eurypterus, in having a less number of joints in the feet, in the eyes being marginal, and in the large size of the antennae. This fine specimen was discovered in the-Upper Silurian beds of Lesmahago, Lanark- shire, Wales. Size, 24 x 13. Price, $ No. 371. Fterygotus acuminatus, Salter. This specimen shows well the singidarly square form of the head-shield and the marginal position of the eyes on its anterior border. From the same local- ity as the preceding. Ori-inal in the private Geological Cabinet of Mr. Ward, Rochester. Hize,Q^. Price, $ No. 372, Fterygotus Anglicus, Agass. Body. Segments asd Tail.
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectfossils, bookyear1866
