. Catalogue of casts of fossils, from the principal museums of Europe and America, with short descriptions and illustrations. Fossils. CRUSTACEA. 95 Sub-Class II.—Entomostraca. The Crustacean species which compose this division are usually small and covered, partially or wholly, by a thin horny shell of bivalvu- lar form. The absence of a series of abdominal appendages is the most persistent characteristic. A few of the fossil Entomostracans are of quite large size, but the majority are very minute and in such countless numbers that they assist by their multitudinous atoms in building up thick
. Catalogue of casts of fossils, from the principal museums of Europe and America, with short descriptions and illustrations. Fossils. CRUSTACEA. 95 Sub-Class II.—Entomostraca. The Crustacean species which compose this division are usually small and covered, partially or wholly, by a thin horny shell of bivalvu- lar form. The absence of a series of abdominal appendages is the most persistent characteristic. A few of the fossil Entomostracans are of quite large size, but the majority are very minute and in such countless numbers that they assist by their multitudinous atoms in building up thick strata of the earth's crust. The larger and more highly organized forms occur in the Palaeozoic Rocks. ]No. 363. Dithyrocaris Neptuni, Hall. Caudal Spines. This large Phyllopodous Crustacean had a naked body, or only the head and thorax covered by the carapace ; foliaceous and gill-bearing limbs, serving as respiratory and natatory organs, and numerous feet. Its tail was armed by a very conspicuous trifid spine. Hamilton Group (Devonian), Otse- go Co., N. Y. No. 364. Limuhis gigantens, Miinst. This ancient '•• King-Crab," like those of the present day, was covered by a cephalo-thoraxshield; the append- ages were all oral; and the eyes were sessile and placed in the upper surface of the shield. It belongs to the Crustacean order Pcecillopod, or those which have the feet of different segments of the body applied to different uses. This fine specimen is from the Lithographic lime- stone (Upper Oolite) of Eichstadt, Size, 20 x 12. Price, $ No. 365. Limuhis Walchii, Desm. A slab which shows the specimen both in impression and in relief. From the same locality as the preceding, and now in the private Geological Cabinet of Mr. Ward, Rochester. Size, 10 x 6. Price, $ No. 366. Limuhis "Walchii, Desm. From the same locality as the preceding Size, 7x5. Price, $ Nos367. EurypteniS lacustris, Harlan. The genus Eurypterus—the Idotea of Scouler—w
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectfossils, bookyear1866
