A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history) . the restbearing gills on their hinder surfaces. Limulus then differsfrom the Eurypterida mainly in the fusion of the abdominalsegments and their reduction from twelve to six. In thevery young Limulus, however, there are nine such segments, AKTHEOPODA—. ?AEACHNIDS. 89 not yet fused, and there are among the older fossils of this G-alleryOrder many that show a similar or greater approach to the plan. The first of these exhibited is tlie SilurianNeolim
A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history) . the restbearing gills on their hinder surfaces. Limulus then differsfrom the Eurypterida mainly in the fusion of the abdominalsegments and their reduction from twelve to six. In thevery young Limulus, however, there are nine such segments, AKTHEOPODA—. ?AEACHNIDS. 89 not yet fused, and there are among the older fossils of this G-alleryOrder many that show a similar or greater approach to the plan. The first of these exhibited is tlie SilurianNeolimidus, with at least nine free segments ; then Hemiaspis, Table-casein which the last three are narrower than the others and arefollowed by the telson. Belinurus from the Coal Measureshas eight abdominal segments, of which the last two or threeare fused; while in the contemporaneous Euprodps [Prest-icicliia] the segments are reduced to seven, and these arefused. If the Coal Measure fossils known as Cyclus are notlarval stages of the contemporaneous Xiphosura, one canonly say that they are just what one Avould expect those.
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