. Geological magazine. IX. ^ See Mon. Brit. Foss. Crustacea, Order Merostomata, by H. Woodward, pt. r,pp. 214-218, pi. xxxiii and explanation: Pal. Soc. Mon., 1878. Dr. Henry Woochcard—Note on Cyclus Johnsoni. 491 Bearing in mind i\in,i Prestwichia rotundatn, P. Birtwelli, and otherCoal-measure forms of Xiphosura, apparently, are not more advancedin development, as compared with the living king-crab, than the laterlarval stages of Limidus polyphemiis when first quitting the egg, asrepresented in our monograph above quoted, then, if we ventureto assume that the curious forms referred to the gen

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. Geological magazine. IX. ^ See Mon. Brit. Foss. Crustacea, Order Merostomata, by H. Woodward, pt. r,pp. 214-218, pi. xxxiii and explanation: Pal. Soc. Mon., 1878. Dr. Henry Woochcard—Note on Cyclus Johnsoni. 491 Bearing in mind i\in,i Prestwichia rotundatn, P. Birtwelli, and otherCoal-measure forms of Xiphosura, apparently, are not more advancedin development, as compared with the living king-crab, than the laterlarval stages of Limidus polyphemiis when first quitting the egg, asrepresented in our monograph above quoted, then, if we ventureto assume that the curious forms referred to the genus Cyclus arebut the larval stages of those Coal-measure Limuli, we may mostcertainly conclude that they would represent in point of structurethe still earlier phases of Limulus, they having been, so to say, moreprecocious in quitting the egg than their modern example, in the earlier stages of development of the fertilisedegg in Limidus polyphemus (pi. xxxiii, figs. 1 and 2, op. cit.) only a . X 2.

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Keywords: ., bookcentury1800, bookdecade1860, booksubjectgeology, bookyear1864