. Geological magazine. mostraca. In thoseTrilobites whose early history is known the young, as in Sao,Ptychoparia, TriartTirus, Proetiis, Acidaspis, and Dahnanites, ar&almost as simple, or even more so, in their earliest known stagesas Cyclus (see Beecher and Barrandes figures infra, p. 492). It must, of course, be borne in mind that this is only a suggestion,and may hereafter prove to be of no value ; still, the fact remainsthat the first considerable development of Limidiis-Wke Crustaceansoccurs in the Coal-measures, only one small form, Neolimidus, beingmet with earlier in the Upper Siluria
. Geological magazine. mostraca. In thoseTrilobites whose early history is known the young, as in Sao,Ptychoparia, TriartTirus, Proetiis, Acidaspis, and Dahnanites, ar&almost as simple, or even more so, in their earliest known stagesas Cyclus (see Beecher and Barrandes figures infra, p. 492). It must, of course, be borne in mind that this is only a suggestion,and may hereafter prove to be of no value ; still, the fact remainsthat the first considerable development of Limidiis-Wke Crustaceansoccurs in the Coal-measures, only one small form, Neolimidus, beingmet with earlier in the Upper Silurian of Lesmahagow. We mayalso justly assume that Limidi may be found in all those depositsyounger than the Coal-measures, seeing that king-crabs are livingat the present day widely distributed on the east coast of North 492 F. JR. Con-per Reed—Fossils from Haverfordicest. America, and in the seas of China, Japan, and Molucca; and theyhave already been met with fossil in the Jurassic, Cretaceous, andTertiary EiGS. 1-5.—Youugest larval or Protaspis stage of some Trilobites (after Beecher),for comjDarison with Cyclus. Fig. 1.—Sao hirsiita, Barraude. Cambrian: Skrey, Bohemia.,, 2.—Fti/choparia Ivwffii,Meek. Cambrian: North America.,, 3.—FroetKS 2}arvi>isci/li(s, Hall. Ordovician: New York, ,, 4.—Dalmanites socialis, Ban: Ordovician: Bohemia.,, 5.—OleneUiis asaphoides, Emmons, sp. Lower Cambrian {OJenellus zone). IV.—Sedgwick Museum Fossils from the Haverfordwest District. V. By F. R. Cow-PER Reed, , (PLATE XXIV.) LAMELLIBllANCHIATA. A FEW species of Lamellibranchs were recorded by Messrs. Marrand Roberts - from the Trinucleiis seticornis Beds of Haverford-west ; and though some new species may now be added to theirnumber with the aid of the numerous specimens collected byMr. V. M. Turnbull, yet a complete list of the species is at presentimpossible owing partly to the imperfect condition of many of thefossils and partly to the unsa
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectgeology, bookyear1864
