558 STKATIGRAPHICAL GEOLOGY 



the stages are given under its heading, but the following are more 

 or less common in all three groups : 



Lamellibranchia. Corbula pisum. 



Gastropoda. Potamides elegans, Tonrichia Duchasteli, Bayania fasciata, 

 Melania acuta, Melanopsis carinata, Natica labellata, 

 Neritina concava, Viviparus lentus, V. angulosus, Plan- 

 orbis obtusus, P. platystoma. 



Beptilia. Trionyx incrassatus (a freshwater tortoise). 



Fossils of the Headon Beds and Lower Tongrian 



Actinozoa. Solenastrea cellulosa, Goniopora ( = Litharea) brockenhursti, 

 Madrepora anglica. 



Lamellibranchia. In the marine beds are : Cardita deltoidea, Corbula 

 cuspidata, Dosinia ( = Cy therea) incrassata, Pecten belli- 

 costatus, Ostrea velata, 0. prora, Trinacria ( = Trigono- 

 ccelia) deltoidea. In the freshwater beds are : Corbicula 

 obovata, C. cycladiformis, Erodona ( == Potamoniya) plana, 

 E. gregaria, Unio Solaiidri. 



Gastropoda. In the marine beds are : Ancilla buccinoides, Cancellaria 

 elongata, C. muricata, C. evulsa, Neritina aperta, N. 

 concava, Pisania labiata, Voluta spinosa, V. geminata, 

 V. decora. In the freshwater beds : Potamides concavus, 

 P. ventricosus, P. vagus ( = pseudocinctus), Limnaea 

 longiscata, Melanopsis fusiformis, Stenothyra parvula, 

 Planorbis euomphalus, P. lens, Helix occlusus. 



Mammalia. Dacrytherium ovinum, Dichodon cervinus, Hysenodon 

 minor, Palseotherium crassum. 



Fossils of the Osborne and Bembridge Beds 



Plantce. Chara Lyelli, C. medicaginula, Flabellaria lemanonis, 

 Cinnamomum sp. 



Lamellibranchia. Corbicula semistriata, C. pulchra, C. obtusa, Ostrea 

 vectensis, Area Websteri. 



Gastropoda. Glandina costellata, Amphidromus ellipticus, Cyclotus 

 cinctus, Helix d'Urbani, H. pseudo-globosa, Viviparus 

 lentus, Planorbis discus, Melania acuta, M. muricata, 

 Potomaclis turritissima, Potamides mutabilis. 



Mammalia. Anoplotherium commune, Choaropotamus gypsorum, Palseo- 

 therium magnum, P. medium, Xiphodon gracile. 



Fossils of the\Hamstead and Eupelian Stage 



Plantce. Chara tuberculata, Andromeda reticulata, Arthrotaxis sp. 

 Lamellibranchia. Corbula subpisum, C. vectensis, Dosinia (Sinodia) 



Lyelli, Ostrea callifera, 0. cyathula, Pectunculus 



obovatus, Lucina Thierense, Leda Deshayesiana. 

 Gastropoda. Potamides plicatus, P. elegans, Tomichia Duchasteli, 



Bayania fasciata, Stenothyra ( = Nematura) pupa, Voluta 



Rathieri, Tritonium flandricum. 

 Mammalia. Hyopotamus bovinus, Anthracotherium minus. 



