The Quarterly journal of the Geological Society of London . o-cejaihalus Cooperi, the amphipods by Gampsonyx, both in the CoalMeasures ; and by Prosoponiscus in the Permian. Lastly, the Cirripedia, by the anomalous form made known in1865,2 under the name of Turrileptas, from the Wenlock Limestone. In November 1866, I laid before this Society the evidence uponwhich I based my arrangement of the Pterygoti and Limuli in oneorder, for which I adopted Danas very appropriate name of Mero-stomata (or thigh-mouthed animals)—expanded to include allthose ancient crustaceans comprehended in the two subor
The Quarterly journal of the Geological Society of London . o-cejaihalus Cooperi, the amphipods by Gampsonyx, both in the CoalMeasures ; and by Prosoponiscus in the Permian. Lastly, the Cirripedia, by the anomalous form made known in1865,2 under the name of Turrileptas, from the Wenlock Limestone. In November 1866, I laid before this Society the evidence uponwhich I based my arrangement of the Pterygoti and Limuli in oneorder, for which I adopted Danas very appropriate name of Mero-stomata (or thigh-mouthed animals)—expanded to include allthose ancient crustaceans comprehended in the two suborders ofEurypterida and Xiphosura and forming two groups of long-bodiedand short-bodied forms, quite parallel to the Brachyoura andMacroura in the Decapoda ; even the intermediate forms—corre-sponding to the Anomoura—being paralleled by the Hemiaspidse(Hemiasjpis, Pseudoniscus, etc.). This group formed the subject of 1 Engraved and published by J. W. Lowry, and sold by J. Tennant, Strand. 2 Quart. Journ. Greol. Soc. vol. xxi. pi. xiv. p. 486. W w Hft. IDECAPODA /2 lxxii PROCEEDINGS OE THE GEOLOGICAL SOCIETY. [Ma 1895, a monograph published by the Palaeontographical Society (1865-1878, pp. 263, pi. xxxvi.), comprising 17 genera and 84 species—69 of which are Palaeozoic in age. Writing to me, in ~Nov. 1867,Prof. Huxley says : I am a convert to the Merostomata in yoursense. The integrity of this group, founded on the researches of Huxley,Salter, Dana, Hall, and many others besides myself, has beenmaintained, although many attempts have since been made todetach it from the Crustacea and place it with the instance, it was proposed by Dr. Dohrn, in 1871,1 to includethe merostomata in a still larger division, under Haeckels termGigantostraca, which was made by expansion to embrace themerostomata and the trilobita, and to be placed between the Crus-tacea and the arachnida. Against this classification I urged that these animals, more espe-cially the trilobita, being
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