xvi INVERTEBRATE PALAEONTOLOGY 



FACING PAGE 



PLATE IX 136-137 



LOWER PALAEOZOIC FOSSILS 



FIG. 



1. Didymograptus murchisoni. Llandeilo, Abereiddy. 



2. Monograptus sedgwicki. Llandovery, near Girvan. 



3. Strombodes typus. Wenlock Limestone, Much Wenlock. 



4. Favosites gothlandica (longitudinal section). Wenlock Lime- 



stone, Presthope, Salop. 



5. Halysites catenularia. Wenlock Limestone, Much Wenlock. 



6. Dendrocystis scotica (after Bather). Caradocian. 



7. Cydthocrinus sp. Wenlock Limestone, Much Wenlock. 



8. Lingulella davisi. Cambrian, Tremadoc. (Partly based on 



Davidson's figure.) 



9. Orbiculoidea rugata. Upper Ludlow, Onibury, Salop. 



10. " Orthis" (? Dalmanella) testudinaria. Caradocian, Marsh- 



brook, Salop. Restored from casts and moulds (see PI. vi. t 

 Fig. 2). 



11. Strophomena expansa. Caradocian, Soudley, Salop. Restored 



from mould of ventral valve (partly based on Davidson's 

 figure). 



12. Chonetes striatella. Upper Ludlow, Onibury, Salop. 



PLATE X 136-137 



LOWER PALAEOZOIC FOSSILS 



1. Atrypa reticularis. Ludlow Limestone, Weo Edge, Salop. 



2. Orthonota rigida. Lower Ludlow, Whettleton, Salop. 



3. Omphalotrochus discors. Wenlock Limestone, Dudley. 



4. Tentaculites. Caradocian, Marshbrook, Salop. 



5. Orthoceras bullatum. Upper Ludlow, Onibury, Salop. 



6. Parabolinella triarthra. Shineton Shales, Belswardine Brook, 



Salop. (Slightly restored.) 



7. Ogygiocaris buchi. Llandeilo, Builth. 



8. Cryptolithus (" Trtnucleus") concentricus. Caradocian, Onny 



River, Wistanstow, Salop. 



9. Ceratiocaris lleptodactylus. Lower Ludlow, Martin's Shell, 



Leintwardine, Herefordshire. 



