A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history) . hire, under surface, about tw^ice nat. size. ( 1. Pocock.)(Both blocks lent by Messrs. Constable, from Lankesters ExtinctAnimals.) known as pectines (combs). It is possible that the breathingorgans on segments nine to twelve remained as in theEurypterida. But in Eoscorpius of Carboniferous age animportant change has taken place in that the covering plateshave closed over the lamellae of the gills, leaving only slit-like openings called stigmata. Thus when the a
A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history) . hire, under surface, about tw^ice nat. size. ( 1. Pocock.)(Both blocks lent by Messrs. Constable, from Lankesters ExtinctAnimals.) known as pectines (combs). It is possible that the breathingorgans on segments nine to twelve remained as in theEurypterida. But in Eoscorpius of Carboniferous age animportant change has taken place in that the covering plateshave closed over the lamellae of the gills, leaving only slit-like openings called stigmata. Thus when the animalemerojed from the water the lamellae remained moist, and AETHEOPODA—AEACHNIDS. 91 breathing took place by the admission of air to them through G-allery the stigmata. They are no longer gills, but lungs. Specimens ipgj^-j^Q^eg^ge of EosGorpius from England, and a fine scorpion from 23. Bohemia called Ci/clojMialmus sue exhibited. Later scorpions Wall-casediffer in no important respects from Eoscorpius. Adjoining the British fossil Eoscorpms are some other Table-easeCarboniferous Arachnida, mostly found on splitting open. Fig. 44.—An example of the Antliracomarti, Eophrynus Prestvicii, fromthe Coal Measures of Dudley. A, upper surface; B, side view of frontshield, the front end being to the left; C, under surface. i-VJ, appen-dages of the fore-body, the base of ii bearing a biting process, mx;car, front shield with eye-pit, o; pr. st, sternal plates on its under sur-face ; the upper (tergal) and under (sternal) segments of the hind-bodyare lettered 1-lOtg and l-9st respectively, that lettered gen. tg in Acorresponds to the generative openings on the under side. Enlargedabout 2 diameters, (From R. I. Pocock, Geological Magazine, 1902,by permission of the Editor. Table-case 23.) nodular concretions of ironstone that occur in the CoalMeasures of Staffordshire and Lancashire. The most interest-ing genera are Aiitliracosiro and Eoplirynus (^Fig. 44), whichbelong to a group ca
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